Magnet-URI's are now supported by almost every p2p app, including Azureus, DC++ and emule as well..
I believe this is going to be the future of p2p, and XOOPS should be one of the pioneer cms' to support it ;)
More info about the Magnet-URI can be found at the SF.net page HERE
I would want to use it for releasing files on the distributed tracker built into the new version of Azureus, more information about Azureus in combo with magnets can be found on the official wiki HERE
If anyone is interrested in developing this definitely let me know. I am almost done with my uni, which was geared towards UI design & user friendliness.. So I could give you some proper documentation for the project if necessary!