MWSnap is a great screen capture utility

From its site:

• 5 snapping modes.
• Support for BMP, JPG, TIFF, PNG and GIF formats, with selected color depth and quality settings.
• System-wide hotkeys.
• Clipboard copy/paste.
• Printing.
• Auto-saving, auto-printing.
• Auto-start with Windows.
• Minimizing to system tray.
• An auto-extending list of fixed sizes, perfect for snapping images for icons and glyphs. 
• A zoom tool for magnifying selected parts of the screen.
• A ruler tool for measuring screen objects lengths.
• A color picker showing screen colors with separated RGB parts.
• Fast picture viewer.
• Adding frames and mouse pointer images.
• Multilevel configurable undo and redo.
• Multilingual versions.
• Configurable user interface.
• And more...

And it's free.