Switched to Sonic.net about 2 months ago and love it! Twice the speed (getting over 6 megabit now) of AT&T and for 1/2 the cost ($40/month vs. almost $80).
Hmmm, is that considered fast? On Comcast in SF I get about 20Mbps down and I never really thought of it being particularly speedy.
edit: Someone should create a website that both tests your speed, but then also shares that result with the world (anonymously). I'd love to pop up a list of ISPs in a specific city and see exactly how accurate their listed speeds are before buying.
Does Speedtest.net not do this for you? There is the small problem that the local Speedtest.net server was moved from a high-quality independent ISP to Comcast, so all Comcast speed tests are now completely unrealistic.
I'm on sonic.net and get 20mbps down, 2 mbps up. You need bonded Fusion service to get those sorts of speeds though.
dslreports.com has speedtest results, down to zip code, though they don't include things like what service product and/or whether the service has some bandwidth cap.
I have AT&T U-Verse (fiber to the end of the block, copper to my door), and I get 18mbps down, 1.5mbps up for $55/mo (internet only, no landline). I was paying $99/mo for 15mbps down, 2mbps up with Time Warner (internet only, no TV/phone).
The price? $20/month. But I am not in USA.