They have a excellent add-on for Firefox 2.0+ that will help you grab a screenshot of any webpage with a simple right click and it will automatically export the image to Picnik image editor for further editing (like resizing, including borders, overlay text, rounded corners, etc)
For instance, this page from Steve Rubel was enhanced using the Vignette / Matte effect and it's trasformed from a boring screenshot into something that immediately invites attention.

You can screen capture either the visible portion of the webpage or the entire webpage even if extends several folds. Very handy for saving snapshots of webpages (like an ebay paypment receipt) or for creating thumbnail images of your websites for MyBlogLog, Facebook or other services.
Picnik Firefox Add-on | Picnik.com
The Picnik Screen capture extension is Firefox only but here are some screen-capture options for IE. And some more Firefox extensions for taking screen capture of websites and HTML web pages.
Reader Comments
Great find. I have been using another extension to generate png-screenshots, but since I'm familiar and rather happy with using Picnik, I may consider replacing extensions.
Written on 26/5/07 3:25 AM
thanks for the nice tip. It really helped me. I am a member of many forums and many a times i have to post screenshots of some sites but i was not able to take screenshot of the full webpage(scrolling page). Thanks again
I am very much inspired by your blog and i also started a blog.
plz take a look at my blog
www.myproblog.blogspot.com
thanks again
Written on 27/5/07 9:30 PM
I have just discovered your blog and must say how much I like it.
I'll make sure I pop in in the future.
I'd love it if you ever get the chance to say hello on my blog.
Take care,
Philip
www.disabled-help.org
Written on 28/5/07 1:43 AM