Prompt service for screenshots?

Google?

fireshot?
Or you need to use for any project to automatically generate the screenshots?

search for.
I paid a closer look, such as thumbshots.com.

extension for google chrome is great stuff, I recommend
there are for firefox

Similar services on the web quite a lot. Free accounts usually limit the screenshot size and the number of screenshots in a month.
For example, a couple links:
\rwebsnapr.com
\rthumbalizr.com

www.girafa.com/
\rwww.pageglimpse.com/
\rwww.websnapr.com/premium_services/
\rwebthumb.bluga.net/home
\rwww.scurlr.com/com.boxysystems.scurlr.Main/Main.html
\r
I'm more inclined to pageglipmse

Use Pixlr.com they Have Pixlr Grabber addon for FF and Chrome pixlr.com/grabber
Chose, because next is still and online photoshop Pixlr Editor, all together — very convenient