Support Forums

Some of you may already know about this, others may not.
I find this useful when i just want to register somewhere quickly and not use my real email address.
All you have to do is visit the link and it will generate a disposable email account for you. It gives you 10minutes until it self destructs, you can also ask for more time.

http://10minutemail.com/

Theres a few like this. Good for referral sites!

There is a few, some of them muck you around though.

I used to use Mailinator.com but quite a few sites now block their addresses. On the plus side they apparently just got some new domains on their network so they might work again.