awsome work love the features, it is the best front end for mining on windows with a dedicated box, Just some ideas...
can you make the OSD optional? and have a "summary" tab? the device selection box needs to be wider(drop down). it would be nice to have each client and GPU together in 1 or make the windows border expandable. For some weird reason I get 10 MH/s slower with this than GUIminer on each GPU, Using all the same phoenix riser version and the same settings. If I even get this worked out why I would use this full time.
//Edit
Is there any reason this is slower than GUIminer? I placed it in the GUIminer folder which has phoenix ect.. with all the same settings it was atleast 10 MH/s slower for each GPU