TOLIP  This is the worst piece of software I've ever seen. It launches at boot and is not controllable as a login startup item.

And: IT CRASHES AND CRASHES AND CRASHES AND CRAHSES .............. (Version 4.5.7.0 on Mac OS X 10.5.x).

Very bad!  
(Version 4.5.70)

TOLIP  Forgot to tell: I connected Mac mini DVI -> HDMI.  
(Version 3.7.9)

TOLIP  @ jofarmer: My LCD-TV has 960x540 resolution, but expects 720p-signal, so I tried 1280x720. This setting worked, but didn't fit in the screen due to overscan (image too big, no OS X menu bar visible). Then I started to adapt the resolution with the "Quick change" arrows in SwitchResX (only arrows, didn't touch the values directly!). After 3 hours of trying and rebooting I finally found a suitable resolution (1216x684). I'm very thankful for this tool.  
(Version 3.7.9)

TOLIP  Very good tool. Made my Mac mini work with my LCD TV-Screen at resolution of 960x540.  
(Version 3.7.9)