Yahoo Fire Eagle
We did small research on Fire Eagle. It is a great service with really cool features. I was so excited about retrieving location via cell tower id. It feels so great that you can avoid any business with mobile operator.
However we have tested it in Zagreb and it does not have info on our cell tower ids. I guess thay need some time to gather data about it first.
Second thing is that you cannot use it as a white label API but your users have to have account on Yahoo FIre Eagle and let you use their data. I think that we will support that in Shout’Em but besides that we will use their geocoding and zonetag services internally for users which does not have Yahoo accounts.