http://www.who-s-web.com/
nice mashup of google maps for web 2.0 talents and events. more interesting the distribution of information - where are the early adopters of such services

http://walkscore.com/
perfect , google maps mashup and for a militant walker like myself quite interesting. density of tips in local neighborhoods is poor, but then I know whats available here anyway. interesting to compare west coast/ east coast, skandinavia, uk and japan.

http://walk2web.com
working on a project that is featured on t-mobiles web'n'walk the URL above peeked my interest. very web2.0, fun, inspiring and utterly useless.
try
http://walk2web.com/surf/http://moccabeans.com
to learn more about it

wicket = apache wicket
graduated to apache top level and v 1.3 is expected to go final soon. manning is preparing a 'wicket in action' book, and the ' pro wicket' book is also recommended read.
expect a lot of wicket trivia on this site, after long evaluation of all sorts of ways to get information onto the interweb, wicket will finally take over from webobjects.
so moccabeans moves to a complete open source stack (wicket, cayenne, spring, etc.) for future projects. we were busy to build a new foundation and lots of new features to existing apps, so expect to see a new blog/ cms soon and new version of photoserver et. al sometimes later this year.

http://www.vayama.com/
a very nice web 2.0 mashup. feels a lot better than any other of the international travel database interfaces. nice use of google maps, ajax 'did you mean' for airport selection etc.
better stil is destination selection via click on the map!
it's almost as much fun searching for your flight than the flight later on will be.
recommended.
not too surprising backed by one of the biggest dutch travel logistics companies. flying dutchmen ....