PicPick is an useful Windows utility that includes a decent screen capture program, a Paint like image editing software and a whiteboard tool to help you draw freehand on the desktop using your mouse (handy when you are giving presentations).
During screen capture, you can select the "Capture Window Control" mode and capture objects that extend multiple screens (like a long Word document or a lengthy web page). And like SnagIt, PicPick can send screenshot images directly to another programs after capture or it can automatically upload them to an FTP server.
Portable Image Editor
The image editor included with PicPick sports an Office 2007/2010 like ribbon interface and supports tabs so you can edit multiple screenshot images / photographs from the same window.
If you are a web designer, you can use the built-in crosshair tool to determine the coordinates of any point on the desktop screen or for capturing the exact dimensions of an object (in pixels).
And since the software doesn’t require installation, you can put it on a USB drive and use it on any computer.