I just started a new site and have heard that stumbleupon is a great tool, so this thread is perfect! Plus Ive already added a few new sites to my RSS reader just reading the thread, which makes endorsing the stuff being posted a pleasurable experience.
Anyway, my latest article can be found here:
10 Vice that You Should be Embracing
Stumble it, Digg it, Reddit it, whatever strikes your fancy, and I'll be sure to watch this thread and the new reddit one to do the same for you guys.