SnagIt is probably the best screen capture utility that I have ever come across. But it is not free. So if MWSnap or one of the other free tools don't cut it for you - at least save yourself $10 and use the coupon code SNUG. (It last worked on July 14th, 2008).
SnagIt 9.0 is the most current version of this screen capture tool.
I have a license for 6.3 and I am eligible to upgrade to this latest version - so I am going to save myself $30 and go get it for $19.95.