I really like your control but there is one bug that I would be very glad if it could be fixed. The bug only appears when when using the "address" property when adding a marker, when I use just "latitude" and "longitude" everything is ok.
When using the address property with up to 10 markers everything is ok, but when adding >10 some markers isn't shown in on the map. If I refresh the web page some markers is still missing, but not the same as before. It's not the address lookup that is causing the error, cause when I show them ten at a time, every marker shows perfectly on the map. I also tried to wait 1 sec between adding the markers, but the same thing happens, some markers is missing.
Google Map Marker Manager is disabled. I have already looked at the forum post on http://googlemap.codeplex.com/Thread/View.aspx?ThreadId=21254
and that seems to be the same error, but with no solution.