Xnapper - Take beautiful screenshots instantly
Screenshot Tracker - Capture and keep track of full-sized web page screenshots
BrandBird - Brand your Twitter content uniquely
Webshot - Free and Open Source screenshot website service
Supershots - Turn screenshots into supershots with gradient backgrounds
GoFullPage - GoFullPage is an all-in-one browser extension for Chromium, Firefox, Opera, and Chrome that lets you capture screenshots for page layouts.