Okay, I've read all the way through the thread, now. Reapersaurus is correct....many of us don't see anything wrong with the rogue, or with the sneak attack ability (and for rerefences sake...the rogue isn't the only class with sneak attack, just the only core class with it).
Now then, let's talk.
First off, let's start doing an examination of the rogue's dynamic both within and outside of a party of characters. So far, a large part of the examination has only picked and chosen specific examples, including the party when it helps the argument, ignoring them when it doesn't.
D&D 3E is all about resources.
Who has them, how are they used and how fast do they use them are the primary questions.
To wit: Rogues can only get access to sneak attack if certain conditions are met. The defender must be capable of taking criticals (i.e. not a construct, undead or a host of other beasties), have his DEX bonus denied him and not have an evasion-type ability (such as other rogues and barbarians). The defender must be no more than 30' distant for a ranged attack, or usually 5' for a melee sneak attack.
Therefore, unless the rogue is EXCEPTIONALLY fast, chances are that she's going to need help to perform a sneak attack. Chances are that the rogue is taking her cue from the fighter, who engages the beastie (in our 1-on-1 scenario) while the mage stands back. The cleric may engage, but most likely is buffing...clerics have that flexibility, to a point. Still, likely only the fighter will risk getting too close, as he's the only one who can take the punishment. Even the rogue risks an awful lot to do the sneak attack.
At varying levels, the rogue's sneak attack will be more or less impressive, but will never keep scale with the death-dealing potential of a fighter or mage. Compare the empowered-maximized fireball, the finger of death, the power-attacking bull's strengthed weapon focus/specialized magic-weaponed flaming greatsword to the mid-range sneak attack. A party dynamic means the front-line fighter will be armed to the teeth. Even buffed, the rogue isn't dealing that much death. The numbers have been run countless times before, but the threads are long gone. I'm sure someone could run them again, but it's not really necessary.
This is the resources issue, again. If the cleric has one Greater magic weapon memorized, it goes to the fighter. Bull's strength? Fighter first. The rogue will get Cat's Grace, of course. But let's remember...the fighter is using bigger, nastier weapons. A Sword of Subtlety, for example, is just not as devastating as a greatsword fully powered up. At low levels, the fighter hits much more often (let's not forget...to sneak attack, you have to hit first) and at high levels, he's doing much more damage. With a fighter's high BAB, he can power-attack for a sickening amount of damage (never mind the potential for keen, improved criticals...)
All of this still only assumes one target. Add in multiple targets, and the whole dynamic changes, still to the fighter's benefit. With higher BAB, cleave, greater cleave, and the like, the fighter is dropping targets much faster. Higher hit points allow him to take the punishment to dish it out. A rogue with significantly fewer hit points may be dishing out some damage, but is hitting less often, and is going to take some serious punishment herself.
All of this isn't to say that a rogue can't do horrible damage, if she chooses. She can. But the situations in which she can are far more limited than for a fighter of equal level. This is true at first level, and true at 20th level.
Now, if you're running a game there are few combats, and mostly against single opponents, this may not appear to be the case. But within the context of a standard dungeon crawl, where hit points and healing can run low and you may have four to twenty encounters before leaving....things are different. That rogue is going to be much more cautious against six girallons than the fighter is, you can be sure. Especially if there are more on the way. Who cares if you can sneak attack and kill one immediately, if the next one will pummel you into unconciousness if they simply manage to hit twice?
If the issue is that the rogue, when sufficiently buffed by mages and equipment, and backed by a competent fighter is overshadowing the fighter....then the DM is not presenting the players with enough appropriate challenges to the group. This isn't to say that the DM is playing the monsters wrong...it's to say that more elements are needed. Don't punish the players for playing well, and don't target the rogue for being efficient. Instead, create situations where each character shines. The undead, for example, are underrated for the CRs...if there is no cleric in the party. One ghoul or ghast could create a TPK with it's paralysis ability at CR2 or CR3, for example. But the CR assumes that clerics are available, and able to turn it relatively easy. There are plenty of creatures that ignore sneak attacks and criticals, which are often the fighter's chance to shine. Undead are for the cleric. Outsiders are usually for the spellcasters. Ranged combat (i.e. at greater than 30' feet) can be a hideous thing, and the fighter and mage excel here, not the rogue.
By the same token, that group of orcs we've mentioned....they can be buffed by a mage or evil cleric, correct? Imagine five orcs, all with shield, expeditious retreat, bull's strength, equipped with two healing potions and with one level of warrior. And that doesn't require a majorly high-level shaman or spellcaster. The EL would be specificaly higher, of course, but it would have to be to deal with higher level players.
Ultimately, the point is this: under the right situations, in the right locations, with proper support, the rogue is devastating, and can even out-perform a fighter under similar specific situations. However, over a broad range of applications, the fighter will outperform the rogue more often than not, and over any protracted series of combats, such as a typical dungeon-crawl, the rouge's abilities will level out below the fighter's...not above.
I base this opinion not off of conjecture, but the last two years of 3E play. A rogue with strong support is deadly, no question. But unbalanced? I respectfully disagree.