Take Screenshots of Complete Web Pages with Screengrab (Firefox)
A good screen-capture utility is essential for bloggers, site developers, graphic designers, PR folks, and anyone else needing to incorporate images in their print and/or online media. Screengrab, a Firefox extension, lets you capture just about anything in your browser window: the entire page, just the visible portion, a selected area, and so on.
Once it's installed, you simply click the Screengrab icon in the lower-right corner of the browser, choose Save or Copy, and then select the desired capture option. Screengrab can copy to the clipboard or save items in JPEG or PNG format. It's a great little extension that's easy to use, incredibly handy, and, of course, free.
Now, if you need a screen-capture solution that extends beyond your browser, try IrfanView, my favorite freeware image-editing app. If that doesn't do the trick (it has fairly rudimentary capture capabilities), pony up $39.95 for SnagIt, the most robust screen-capture utility I've ever used.