Want to make money from Flash map mashups? One new alternative comes from Lat49, the online ad network for interactive maps, who have just added support for integrating ads into Flash maps. As we covered last year, Lat49 enables map mashup developers to layer geographically relevant ads onto third party mapping platforms like Google Maps and Yahoo Maps. The contextual ads can be placed on top of and alongside the maps themselves. They also offer developers an API for finer control over the ads (details at our Lat49 API profile).