This is the killer feature in Windows 7 as far as I'm concerned. This and the searchable Start Menu.
It's simple, but I use it dozens of times a day. It's quick. It's effective. It's listed in the title of this blog post, completely undermining any attempted suspense. It is, of course, the wonder of ICT Tip 037 - Aero Snap.doc!
A lot of people have no idea that this exists, despite it being useful for nearly everyone. Send it out. Tell them. Share the joy of knowledge. Just
Our staff loved this one. Personally I've never used the gesture much - too much in the habit of Win+D then Alt+Tab - but people were at first disbelieving and then endlessly amused. Says something about school staff that, perhaps.
So for the entertainment and delight of your peers, here's ICT Tip 036 - Aero Shake.doc
Any monetary tips you get from people, let me know and I'll pass you my PayPal details. Not that you should be charging money for these anyway, of course -