I've just updated my Reputation Tracker.
It now really does cover SO, SF, SU and Meta [and Programmers SE -ed.].
Additionally, it has the option of including your flair for each site to display current reputation and badge counts.
The IDs for the different sites are stored in the
meta parameters. For example, my bookmark is (formatted for reading convenience — obviously join the two lines together!):
Old bookmarks (with
user=xxx) will show rep for Stack Overflow only (even if you've got
sites=meta) but the ID will be in the text box, ready for you to resubmit and bookmark.