Utilities & Tools (5293 programs)
Pros: Gives you full control over how to capture awkward shapes. Integrated with iPhoto, Flickr and Mail. Plenty of annotation options.
Cons: Requires a steady hand. Doesn't capture video screenshots.
Pros: Easy to use. Cross-platform. AES encryption. Attractive user interface. One-click and drag and drop. Integration with email and cloud services.
Cons: Not an extensive list of file formats.
Pros: Faster than System Preferences. Allows you to leave a Menu item with no command.
Cons: Using haxies can be dangerous for OS X. No real need to use it Snow Leopard.