Well I guess I should jump in on this one with my opinions.
Paladin: Paladin spells are a lot better than many give them credit for, but I agree the paly should get extra smites. Some other ideas would be to give them additional powers against evil as they gain in level. For example, a pseudo protection from evil the paladin has on all the time, or the ability to stun evil creatures. The paly really doesn't need an overhaul, just a few things here and there at higher levels to make them more attractive and they are fine.
Monk: I think most everyone agrees ki strike is the big problem here. One idea I haven't heard would be to allow ki strike to reduce the damage reduction, no matter what type it is.
For example, at 4th level, the monk gets DR reduction of 5. So no matter if the DR is 15/+1 20/+5 10/holysilver etc, the DR is 5 less than it was when the monk hits it. Then at higher levels, that changes to DR reduction of 10, 15, etc.
I also think that going the OA route of customizing the monk could be a good idea, but its not necessary for balance. Once the ki strike is fixed, I think monk's do just fine in combat.
Bard: The bard needs at least 6 skill points, period. I think WOTC can go one of two ways in upping the bard, either upping the bardic music, spells, or both. It would be nice if there was some bardic music that could cause damage, or deafen. Also, I think having bardic music that emulates the emotion spell in the phb would make a lot of sense for the bard. In increasing the bard's spell power, I think the power of there spells is fine, except that the spell's are boring. The bard's spellcasting is very different from the other spellcasters and should be reflected by having "original spells." Take modify memory for example, very very cool spell, bard only, makes me proud to be a high level bard. A few more of those kinds of spells and the bard is fine.
Druid: The druid on the whole is fine where it is. However, I don't think there is any elemental spell in the phb that the druid shouldn't have. That change, and maybe giving the druid a few more elemental spells would be fine. Also don't forget, since the MM is being changed, the druid may have a lot more creatures to take as companions.
Rogue: The only reason I mention this is because I hear a lot of people say that if you up the skill points of some other classes, you step on the rogue's toes. Well considering the rogue has sneak attack, evasion, uncanny dodge, the best skill list in the game, and some very cool special abilitiies- the rogue is completely fine, and I don't think those rogue lovers out there would suddenly scream that the rogue is now too weak if some other classes got a few more skill points.
Sorcs: Just take away the increase casting time for metamagics please!! Is it so bad that a sorc can cast a quickened fireball? Sorcs are flexible because they can choose spells on the fly. Metamagics are flexible because they can adjust a spell for a different setting. It seems like the two were made for each other, and then the crap with increased casting time.
Ranger: Ah yes, the poor debated ranger. If you listen to most of the veterens around here, the two "real" problems with the ranger are that's it frontloaded, and there no real flavor to the class. Frontloaded is fairly easy to fix, flavors the problem. 6 skill points helps, it lets a ranger actually use many of his skills. I don't think bonus feats are the way to go, now the ranger can be cool by being a fighter wannabe. In some ways, he's already a druid wannabe. I think a good fix for the ranger would be to grant him special abilities against his favored enemies. For example, any favored enemy that is +3 or higher for the ranger might have to make a will save when fighting the ranger or be shaken. Cool things that you can see in the combat, not just "oh wow, +2 to damage". However, if you are going the bonus feat route (it is a fairly easy way to go), make the bonus feats completely unique to the ranger. Don't give him an abridged fighter list, give him all new feats for his favored enemies, maybe the favored terrain everyone likes, some stealth abilities, things of that nature.