I believe that the way I stay up do date with transponders is very easy and accurate. I have installed the following program, I udate all satelites, I show all satelites on screen after update, I save as "skystar.ini" files in a "c:\transponders" folder and at last I copy - paste it in progdvb folder.
http://www.tele-satellite.com/
http://www.satcodx.com