After installing Windows Vista on the HTPC/gaming PC I have set up for the living room I have run into several problems (which reminds me that I have to write about them later). However, I was able to solve a quite trivial one thanks to sleep.exe by Gammadyne Corporation. This simple little program simply puts Windows Vista into sleep mode.
For several reasons I have been trying to find other ways like for instance this and this to put it into sleep mode (without using the start menu) without success. Now, putting Vista into sleep mode is simply done by assigning a short key to sleep.exe and there we are.