If you want to grab a screen-capture and share it via Email, Blog or Instant Messaging try Jing!
RobiNZ CAD Blog: Share a screen capture in a Jing
The Jing Project is an experiment from TechSmith, the screen capture/recording people, who are best known for SnagIt & Camtasia. It offers a little of each product in a slick, easy to use, form for both Windows (XP/Vista) & Mac OS X users.
Jing aims to make grabbing a screen capture easy and sharing it a snap, or should I say a Jing!