We have a group of XWiki users on Frappr.

http://www.frappr.com/xwikiusers

Ludovic

I have one for my blog regulars:

http://www.frappr.com/bootstrapregulars

Got one, too!

http://www.frappr.com/bltb

I'm surprised MyGuestmap hasn't been linked in del.icio.us more. Are there similar services out there? I'd love to have that replace my stupid Bravenet guestmap http://zepfanman.com/gb.php