Okay, here's a way to import your recent favorites/recent songs from Grooveshark into GrooveWalrus.

1. Click on the 'List Sifter' tab in GrooveWalrus.
2. Click on the 'RSS Feeds' tab on the 'List Sifter' tab.
3. Enter:
http://api.grooveshark.com/feeds/1.0/users/[YOUR GS USER NAME]/recent_favorite_songs.rss
or
http://api.grooveshark.com/feeds/1.0/users/[YOUR GS USER NAME]/recent_listens.rss
in the 'Feed URL' field.
4. Click the 'Get RSS Feed' button.
5. Select 'song' instead of 'artist' from the drop-down field.
6. Enter " - " in the 'Sep' field without the quotes.
7. Click the 'Sift List' button.
8. Click the 'Playlistize!' button.