Miscellaneous Tools

Connection Speed Chart - Chart that shows all connection types and their speeds
Conversion Calculator - Nice little speed conversion calculator (KB/sec : Kbps and Kbps : KB/sec)
Conversion Table - Table that shows most data conversions
Forum Archive - Archive of all forum posts to testmy.net sorted by board and month.
Share Score - Share your stored scores as an image, great for using as a signature in a forum.
testmy.net Google Search - Google's advanced search configured to search testmy.net.
ping/trace/whois/dns - Nice little tool box!
RSS Feeds - Some interesting RSS feeds to read, check it out.
Score Database - Check scores in TestMy.net's score database... many different searching methods.
"Tweak your connection" guide - A very popular thread discussing how to get the most out of your connection, also provides links to many other connection optimization threads here at testmy.net.

Primary Testing Tools

Dual Test - a tool for testing your internet connections upload and download speed. (also found under bandwidthtest and broadbandtest)
Download Test - a tool to test your internet connections download speed (also found under bandwidthtest and broadbandtest).
Upload Test - a tool to test your internet connections upload speed (also found under bandwidthtest and broadbandtest).
Automatic Test - a tool to test both upload and download speed on a set schedule, great for graphing your connection over a period of time (also found under bandwidthtest and broadbandtest).

Member Stats - This tool allows you to pull 30 day graph, 7 day graph, all tests details and 30 day test details from either ip address, comp_id, username, affiliate id or test id.
Host Stats - Query based on ISP, see what others scored compare to yourself.
Share Score - Share your stored scores as an image, great for using as a signature in a forum.