Hi - thanks for this definitely useful software.
Would be nice if GrandPerspective had a mean to search for new GrandPerspective versions online directly from the app.
First step could be to simply notify the user when new versions are available. Checks could be triggered manually or at a specified interval (e.g. every week or every month).
Second step would be to implement a mean to update GrandPerspective without the need leave the app (i.e. to go on Sourceforge's website). Maybe you could use code from Cyberduck or another open source software to help you start with this?
In all cases, thanks and have fun! :-)