What you guys will probably point out in the Iteration 2 reviews of our MapYourBuddies project is that when there is a friend in the friends list who doesn't have stored his/her hometown location in facebook (in an appropriate way e. g. only "MI, USA" or not at all) then currently you can click on the name and just a JavaScript error occurs:
markers[id] has no properties
[Break on this error]
markers[id].openInfoWindowHtml(listelements[id]);

To solve this issue I analyzed our current structure and basically we need to merge/integrate/redesign our "create Google Map Marker & Info Window" function with the "create Friends List" function.
Honestly, I guess, I need to rewrite huge parts of the "create Friends List" function to make it work and using the results from geocoding to decide if a "Friends List Entry" should be click able or not (and if not than highlighting this entry).
Anyway, this is a known issue and I probably cannot work on it until the end of next week ... But I am sure, you will mention it in your iteration 2 reviews ;)
- Just that you know, that we already know this issue :)))
-Joern