I'm going to wait for Complete Adventurer. Nothing in Races of Destiny really grabbed my attention as, "cool," either from a player, or DM standpoint.
I have Frostburn, and I like it for its monsters and some of the spells. I was disappointed with the numerous pages of encounter charts at the end of the book, but was suprised to find some use out of them when time was short. I am looking forward to the next book in their environment series.