Mon Calamari
Ithorian
Trandoshan
Sullustan
Wookiee
(Selkath)
The above races all have character models created ingame, but they are only used by NPCs. All of the above, with the exception of the Selktah, were playable in Star Wars Galaxies.
If you look over all the cosmetic options people are and have been clamoring over, it is clear the appearance of one's character is important to many if not most players. I propose adding the above races to the game as playable races. As a short-term fix, it may be necessary to hide the headgear (or feet/hands), or to "stretch" certain gear (like helmets) out to accomodate the character models. I personally would prefer that to not having them in the game at all.
All I'm saying is virtually every major MMO does at least one thing really well. One of those from Galaxies was character creation. As much as I love this game, I feel like all my characters are humans with different skin colors. Let's turn this around and make SWTOR's character creating something to be envied!