Vista has a screen capture tool called "Snipping Tool"

Venkatarangan's Blog [வெங்கடரங்கன் வலைப்பதிவு] - Screen Capture in Windows Vista

The good news is Windows Vista bundles (out of box) a great screen capture tool called "Snipping Tool". The tool helps you to Capture a portion of your screen so you can save, annotate, or share the image.

Use Snipping Tool to capture screen shots
(Thanks to my colleague Murari Rajagopal for telling me about this useful applet)

You can find the Snipping Tool either via Start > Accessories > Snipping Tool or by simply typing Snip into any Search window. But it is easy to create a shortcut for it by using the path %SystemRoot%\system32\SnippingTool.exe. This path should work in all Windows Vista (32 bit) editions. It also has rudimentary painting (pen) tool.