Here’s a cool plug in which allows you to capture and post screenshots directly to Flickr: SnagIt Profile for Flickr
Uploading a capture to Flickr, and then sharing a link to that image, is much easier and more universal than sharing image files as attachments. Using the SnagIt to Flickr profiles, you get the best of both tools – SnagIt’s high-quality screen captures with the ease of sharing on Flickr.
SnagIt is made by the same folks who make Camtasia, one of the better screencasting programs. So it’s not surprising there’s a screencast of how it works too. (Here’s a directory of screencasting tools in case you missed it.)