I just signed up yesterday for xxx-88x-POEM, which forwards to my Cyclops. And, if need be to my LG 3280 Tracfone. And if need be to another cell. Whatever it forwards to, things are pretty neat with GrandCentral.
You get to pick your number, and they have numbers in all the major cities that I can see, and you can configure your "ringback tone" if you want, and set up voicemail, etc. Plus, it's all free right now! I have to say, now I don't feel so guilty that I'll be changing my cell number relatively often to keep up with my sometimes voracious minute needs (I talked an unthinkable half hour on my phone last night...most of my calling was after 7 p.m. but still same cost for me), because no matter what number I'm on people can still reach me. Coolness.
Oh, and you can get your own number at www.grandcentral.com.