A different kind of Chaos / Mailinator
This blog is more and more turning out to be my personal bookmark site...A different kind of Chaos is a nice blog from the guy who made the Mailinator, a service that lets you use fake anti-spam mail addresses without signing up (and even without creating the address before you use it).
He has some relatively long - for a blog, anyway - articles about software development in a business context, and brings up interesting topics with a little bit of humour.
Edit: www.spamgourmet.com is similar in that it offers on-the-spot generation of accounts, but it also has a login, so you are sure to get the mails yourself; and it forwards incoming mail. Altogether a better solution for most things, then.