It was hard for me to decide on what to vote for.
Races that have already been published that I like (in no particular order) are:
Verrik (AE)
Dracha (AE)
Giant (AE)
Mojh (AE)
Kalashatar
Warforged
Shifter
Changeling
Dromite (probably the only level adjusted race I could bring myself to play some day)
Elan
Nezumi (the Rokugan version)
Spirit Folk (Bamboo, River, Sea, and Mountain)
Vanara (I liked them better before their 3.5 update in Dragon magazine, but they still have cool flavor background)
I have only perused Sandstorm and Frostburn in the stores, but I didn't like what I saw in Frostburn for races, though the ones in Sandstorm looked intriguing. I don't care much for any of the core races, except for maybe Human and Dwarf. I absolutely loathe Halflings. I enjoy the concept behind the Aasimar, Tieflings (I loved their flavor text when I first read about them in the 2E Planescape monster book), and Genasi, but I would like to see them better executed with maybe some racial levels like in AE. Goliaths are okay and I can't remember much about the Whisper Gnomes, so I guess they didn't leave an impression on me. The raptorans just seem... well, I rate them one notch above halflings.
I like the idea of the illumians a lot - lots of flavor there, but I really, really, really, despise their floating neon signs that circle their heads. I cannot envision anything except for those neon runes to actually be stating, "Eat at Joes" or, "Universal Studios". They are living advertisements for a fantasy game. Why couldn't the illumians have just had living, glowing, moving runes on their skin that was always located on or near their faces? That would provide the same effects as far as the mechanics of the race are concerned. If I ever have them in one of my games that is how they will be.
Anyway, I ended up voting warforged for overall originality, innovation, and for the unique way they seem to fit into any adventuring group no matter what their class is. It seems like playing a warforged is a bigger deal than what class he is playing and that really makes them stand out. By the way, I didn't care for warforged very much before Races of Eberron, but after reading about the race in that book their inherent flavor starting to really come to light for me and that is what changed my opinion about them.
EDIT: Oh yeah, I forgot to address that new green, plant, fey race from the Races of the Wild; I forget their name. Anyway, they seem pretty original and are a very neat concept. WotC should have expanded upon them instead of the raptorans in that book.