Info
DSLReports.com/ ranking of ISPs
reviews-zdnet.com.com/Broadband_Watch/

Bandwidth Speed Test Site List
Speed Test at:
speakeasy.net (Requires Flash)
testmy.net [Click "Download Speed Test" then "SmarTest"]
DSLReports.com/stest (Points to speakeasy, BroadStar, net@ccess, ...)
  (BroadStar may require downloading updated Java code.)

Note: Speakeasy consistently found my Optimum Online download speed about 20% faster than Verizon FiOS (fiber), while Broadstar and TestMy.net found it about 15% slower. Both were around 10 Mbs download.
On the otherhand upload speeds were 20% slower for Optimum Online with Speakeasy while cable and fiber were the same for Broadstar and TestMy.net; about 1.7 Mbs.

Above tests were done on a Macintosh with OS X 10.4 and a 1 GHz G4 powerbook.
Tests done on a Dell with a fresh copy of Windows 2000 and a 800 MHz Pentium III produced speeds 60% slower except for SpeakEasy over verizon fiber which had speed similar to those on the Mac. SpeakEasy over cable service showed speeds 50% slower on the Dell than on the Mac.

at&t - SBCglobal.net/dsl/speedtest/ Select location in CA, TX, IL, NY, WA, VA
      (upload & download speeds)

at&t/SBC gave results between speakeasy and test my.net on cable (10 Mbs) and very low results (1-2 Mbs) on Verizon fiber.

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Network Performance
ISPs under Data Communications Interfaces