Supercharge your Gmail inbox

http://lifehacker.com/5614073/boomerang-schedules-your-gmail-messages-and-weve-got-beta-invites

A great way to send out emails at the appropriate time, but getting the task out of the way NOW.  I used to just mark them in my inbox and save the draft to be sent out, but my inbox just fills up too fast for that lately.

http://lifehacker.com/5321180/turn-gmail-into-your-ultimate-gtd-inbox

And here's where the real gem fits in.  You can now use multiple inboxs in Gmail, and I never realized that it could be used to keep your main inbox completely empty, so you can be on top of all new emails, while not completely forgetting about the older ones that you delayed.