If you don't think the "prt sc" button (or alt+prt sc for the active window) is enough to take screen captures here are some free alternatives.
Gadwin PrintScreen 3.5 is yet another alternative.
All of these works well in Windows Vista that you have started using or might start using now that it is released to the public.
FastStone Capture is free for non commercial use and is quite powerful.
Jing from those behind SnagIt
This snapshot is taken in Windows Vista using SnagIt. Not free but the best.
Even though Autodesk DWF Viewer is not supported for Vista it does work. I have also got AutoCAD 2007 and ADT 2007 to work as well.