MCE remote, s3 standby, PC button to bring in/out of standby. Havent bothered setting up a script to stop it going into standby if its recording, only two of us here + the missus is pretty clued up so no issues with turning it off. I use ParaLED so we can quickly see if tuners are in use.
HTPC: 3000+ A64 | Gigabyte k8N 939 SLI | 1 gb ddr 400 | 2x mce150 tuners + mce remote | 1x Pinnacle 7010xi dual dvb-s, dual dvb-t tuner, 2xSky motorolla decs with IR server Suite changing channels via MCE remote| ati x1600 pro | 1x250 1x320 gb Seagate IDE drives | 29" sony CRT via svideo | Windows XP sp2
Clients: 2x desktop pc's, 1 wired MVP connected to a 29" mitsubishi