It's so simple, it's not really a bookmarklet...
I added a bookmark in Firefox which points to
http://del.icio.us/jmesnil/%s and added a keyword
d for it.
So now when I want to go to my del.icio.us java bookmarks, I just have to type
d java in the address bar to go to it.
If I want to go to my java and jms bookmarks, it's
I'm a total keyboard junkie. Too much emacs has definitely hurt my brain.