If you plan to export mp3 files
Save lame_enc.dll into c:\Program Files\Audacity  (screencast guide)

If you would like to use the delicious Firefox extension
  Add the  del.icio.us extensions to Firefox

If you would like to add search functionality
 Add these search options to your browser search tab
  (del.icio.us , Technorati, Flickr tags, Answers.com, Wikipedia)
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If you would like to access flash pages
  Activate Flash by going to this page and following the 'Install missing plugins' instructions (top right)