PUBLIC MARKS with tags screencapture & online

provides a white-label web service API for generating web thumbnails and full size snapshots of websites. WebThumb offers more features and quicker response times then any other service. * Real-time thumbnails * Flash 10 Support * PDF Support * Quick response times * REST API * API clients for PHP, Ruby, Python * Cache the thumbnails on your server or Webthumbs * Browser windows from 75x75 to 1280x2048

Windows only...

has Firefox add-on to capture webpages

Nice w/ drag n' drop