Screen capture tools
A tutorial for ScreenHunderPro is available here but it is pretty much the same for the free version. Please note that Murku allows you to create one frame with chat buttles and other graphics effects. You still need Screenhunter to capture specific areas and use an editor to assemble your frames into a comics page.
2. If you are using Windows Vista, you already have a nifty screen capture tool at hand, Snipping Tool
Places to upload your comics
1. Calam
eo
2. Koinup