ZScreen is an open-source screen capture program for Microsoft Windows. It can upload screenshots, pictures, text & files and put the URL in your clipboard in a single keystroke.

-= Captures =-
Entire Screen
Active Window
Selected Window
Crop Shot
Last Crop Shot
Periodic Screenshots via Auto Capture
Clipboard Upload
Images from Drag & Drop Window
Screen Color via Screen Color Picker

-= Features =-
Multiple-monitor support
Support for uploading screenshots/images to common Image Hosting Services
Balloon tips, sounds, and ability to show cursor in screenshots
Upload images from the File System via Clipboard upload or Drag n Drop
Auto-update (via code.google.com)
Watermarks

-= Image Uploaders =-
ImageShack
TinyPic
Flickr
ImageBam
ImageBin
TwitPic
TwitSnaps
YFrog
Deki Wiki
Custom Uploader
Clipboard
File

-= Text Uploaders =-
Pastebin.com
Paste2
Slexy 2.0
Pastebin.ca

-= File Uploaders =-
FTP Server
RapidShare
SendSpace
FileBin

-= URL Shorteners =-
3.ly
bit.ly
is.gd
kl.am
TinyURL
TURL

-= Text Services =-
Language Translator
Directory Indexer