I’m using a nice screen capture tool called Bug Shooting. The latest version is available for a modest fee but the previous version is still available from the author as freeware. It’s a bit hidden mind.
http://www.bugshooting.com/Home/LicenseDownload?Product=1
It offers nice cropping, highlighting and annotation features and it integrates nicely with various bug tracking apps such as Fogbugz, JIRA and SpiraTest. It also saves your grabs in a sensible format (JPG, BMP or PNG) or copies them to clipboard.
I found this to be a neat replacement for the Fogbugz Screenshot Tool. This is a beautifully simple tool but sadly is available only with Fogbugz.
Bug Shooting is also available for free for personal use. Visit http://www.bugshooting.com