TEd, Bugmenot and Mailinator both sit next to each other on my Links toolbar, and are often used. Mailinator works great, especially for signing up for those sites that require a valid email, as they send a confirmation message to that address before you are signed up.

Slithy, the easiest way to use Bugmenot is to use the "bookmarklet" they have created. Drag it to your Bookmarks menu, and when you are on the registration page for a site, click on the "bookmarklet" and it will open up a new window with (at least) one ID and password for the site you are currently on.

I've been an evangelist for these two ingenious sites for months now, and it is good to hear word is starting to spread.