For my first Sci-Fi race familiar to everyone out there, even though it's not a Star Trek game, I'll go with Klingons (they are in my game).
Klingon
Klingons come from a violently active homeworld. Between the violent weather system, the active volcanic system, and the huge number of lethal flora and fauna, Klingon evolution has imbued them with a redundant set of internal organs, and a natural toughness horrific to behold by their enemies.
Slightly stronger than the average human, and much tougher, humans are a bit more intelligent, and have a higher level of self discipline. Klingons tend toward more martial lifestyles, and delight in combat in general, and specifically in hand to hand combat. Even though these warriors delight in warfare, they're nearly as happy dealing with politics, and diplomacy. Klingons approach politics and diplomacy in the same fervent manner with which they approach combat.
Klingons are on average slightly taller than human average, ranging between 5'6" and 6'8", though some shorter, and some taller are certainly known to have occured. They are also of a denser muscular structure, and have higher density bone structure resulting in the average weight of a Klingon ranging between 180 lbs (82 kg), and 340 lbs (154 kg). Physically, Klingons tend toward darker skin tones, and muscular builds. In addition to this, Klingons have a bony ridge that stretches from the bridge of their nose, over their skulls, and down their backs. The hair on their scalps begins midway between their foreheads and the back of their heads, and is normally pitch black in their youth, and turning grey or silver as they head into old age.
Klingons tend to act before thinking, and let their emotions rule their actions.
Species Traits
Klingons share the following species traits:
Type: Humanoid (Klingon)
Size: Medium-size. Klingons have no special bonuses or penalties due to their size.
Ability Modifiers: +2 Strength, +4 Constitution, -2 Intelligence, -2 Wisdom, +2 Charisma. Klingons are very resilient, and somewhat stronger than humans, with a strong force of character. Klingons rarely pursue scholarly or academic lifestyles.
Speed: 30 feet.
Planetary Adaptation: Klingons come from a hot world, and gain the benefits of the Planetary Adaptation: Hot World feat for free.
Toughness: Klingons have the Toughness feat for free.
Robust: Klingons gain the benefit of the Robust Tough Hero Talent, gaining +1 Hit Point every level.
Skill Bonus: Klingons gain a +2 species bonus on Intimidate checks, Intimidate is a permanent class skill, Klingons gain a +2 species bonus on Spot checks, Klingons gain a +2 species bonus on Listen checks.
Free Language Skills: Read/Write Klingon, Speak Klingon.
Level Adjustment: +2
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I'm slightly unsure about the level adjustment... It
might need to be raised to +2. Comments? It probably wouldn't take much to convince me that it is, but I'd like to see comments both ways.
Also... when I do up the Vulcans, I'm not going to tone them down for balance. They'll likely be a +2 or +3 LA species... maybe even +4. They're insanely strong.
Edit.
Disclaimer! I'm not challenging any copyrights. Klingons are copyrighted to ... errr... someone who isn't me, and are used without any semblance of permission. This is strictly a fan work. They're certainly not OGC.
Edit edit.
Okay... made some tweaks based on comments here, and in an IRC channel. Intimidate is now a permanent class skill (quite the consensus on that), -2 Wisdom with a bonus to the skills in question, and +2 LA instead of +1.
Something about what I'm doing with this. I'm not trying to create a balanced +0 LA species, I'm trying hard to stay faithful to the flavor of the race in question. I personally think that's more important than a +0 LA.

Please feel free to tweak or tone them down in your game if you use them. This is how they are for my game, though. And hopefully, it's a solid jumping off point for others to tweak them to fit their games.
Edit again...
Changed the individual Spot and Listen species bonuses to the Alertness feat.
Here we go again....
Changed it back to +2 species bonuses. Just makes more sense.