You might have seen this in the showcase board but I thought I'd advertise it here as it is quite a useful tool.
http://forum.thegamecreators.com/?m=forum_view&t=194938&b=48
This tool can be used to define and load polygon shapes for specific images. The shapes can be built up from multiple polygon shapes (up to 12 points per shape) and exported into an easy to load text format (loading code included).
The latest update will be available in the first post (updated twice today already but about finished now I think!).