I don't know if this has already been done, but my friend and I have been maintaining our own lists of Railss-related bookmarks on del.icio.us, and we've decided to use collaborate and share our Rails-related stuff under a communal account:
http://del.icio.us/railsbookmarks
If you'd like to contribute, simply add 'railsbookmarks' to your del.icio.us network and whenever you submit a Rails-related link to your del.icio.us account, add 'for:railsbookmarks' as a tag.
I have a scheduled ruby script that takes the new links in 'links for you' and saves it into the account.
Thanks, Nelson