There was talk earlier about the Google Measurement Lab which is the suite of online tools to see, among other things, if you're being throttled.
The Wireshark conference, Sharkfest 09, is now featuring a session on the tool set. The conference runs from June 15 - 18th.
I'll be at the conference again this year. Last year was an awesome time, I learned an incredible amount about Wireshark (and I use it on a daily basis). It's at Standford this year.
Sean