Hi,
I've committed today a new plugin to the geany-plugins project. As the name might already imply, its a plugin to check whether there is a new Geany version available or not.
For compiling you will need to use the waf build system (integration with autotools not finished now) and the devel package of libsoup. The general function is not very 'exciting', but would be happy for any feedback.
Cheers, Frank