The Ultimate Screenshot Tool: Screenpresso
Screenpresso is a simple-yet-powerful & free screenshot tool that improves your Ctrl+Print function.
It can capture the entire screen, region or window with various options like "including the cursor", "automated resizing of them" or even "applying automated effects".
The tool sits in the system tray & allows you to keep an history of the last 100 screenshots.
It can auto-name the captured images or batch convert them (resizing & adding effects) after they are taken.
The screenshots can be drag'n dropped into any application or there are other sharing features like "send to e-mail", "send to Twitter" or "save to clipboard".
Screenpresso also has a built-in image editor that can apply image effects, insert objects (textboxes, arrows, annotations, etc.), apply resize or crop to the screenshots.
For Mac & Linux users, sadly, it only works in Windows.