DH handles most of that stuff, and I think he pretty much disconnects and turns off most things. I really should find out what he does, just in case I need to do it myself someday.
One thing I always do is inform the local police department when we'll be away, our cell phone numbers, a local emergency number (FIL), what lights will be on (timers), and what cars will be in the yard, as well as the fact that we haven't asked anyone to check on the house (so they know that if they see someone there, it's not our doing). I found out how well they check on the house when, in August, they interrogated my DD's friend, who had gone for a walk and decided he'd stop in and say hello. No sooner did he knock on the door, then a cop pulled into the driveway, asked him a bunch of questions, had him sit down at the picnic table while he called in his name for any priors, etc. Poor kid...he was scared to death! But it's nice to know the police are doing their jobs.