Ok - all good ideas-thank you!
I thought about the earphones for iPhone since he likes to listen to podcasts-talk radio while he works. I think the gift certificates are practical and that's my "go-to" gift with coworkers and friends but I want to put some more thought into it for him.
He's not an outdoorsman-He's more of an intellectual/cerebral type and he has an engineering degree. So he loves building stuff (especially electronic gizmos) He likes Star Trek-Next Generation (not fanatically-lol) and war movies. I got him the Band of Brothers series for a gift a few years ago
The drill would be a great gift but he has several already. Home depot is like his Disneyworld for adults-can spend hours there.
If I asked he'd probably say "anything" but I know he likes me too cook for him because i'm a pretty good cook and as a single guy home cooked meals are kind of a treat.