I love all-in-one utilities that do a bunch of things in as little space as possible. Aside from allSnap, I recently bumped into another tool that I use as a regular adjunct to my Vista installs: PowerMenu.
PowerMenu adds four things to every single control menu for a window: a priority control, a transparency control, an "Always On Top" function, and a "Minimize to Tray" tool. That's three or four separate utilities packed into one, and even though PowerMenu was originally written back in 1998 (!), it still runs extremely well with Vista. Obviously I'd like to see it brought up to date whenever possible, but it works well enough right now that I can recommend it with little hesitation.
Serdar:
Thanks for posting this. This is such a great but minimal utility. I expect to get a lot of use from this.