Are you Del.icio.us and Firefox user? If the answer is yes this tool can be very interesting for you.

Features

• Jump to Tag feature (press F2) allows you to quickly access tags and
  bookmarks using the keyboard
• New layout for saving bookmarks
• Preferences now in a separate dialog under Tools (which also can be
  invoked via the prefs button on the FF Add-ons pane)
• Status bar indicators for network activity, new links for you, and the del.icio.us website
• Classic mode for users who just want simple buttons without the overhead of sync

More info here

Enjoy