Free images

The following are the tops sites providing images:
Stock.XCHNG (Tons of Free Images)
Morguefile (Also free images)
iStockPhoto (Not free, but Affordable prices)
Corbis (Excellent images but expensive)
GettyImages (One more Paid Site with good images)

Screen Capture in Windows Vista

Apple Mac 10.x have an easy to use Screen grab tool in-built in the system menu.
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.
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. The tool allows you to copy the URL associated with a screen area and you can control this in your application through this API.