4th-ing del.icio.us!

It will install a toolbar straight to IE, Firefox, or Safari so that all you have to do is click "tag." You can throw as many tags on as you want. I've got many that correspond to "typical" GTD someday/maybe sorts of lists: read.review, might.wanna.buy, might.wanna.try, etc. It's a champ for storing that kind of info.

I hear there's also a really useful little del.icio.us widget for the Google Sidebar, but I don't use the sidebar...