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.