Music CDs, movie VCDs or DVDs are always an option. Books are a good bet too. You might even want to consider setting up membership at the local library or movie club for him.

If you're looking to get him out of the house, a month or year's membership to the local gym or swimming pool is a good option.

You know he's going to love whatever you decide to give him, but to make it just a little extra meaningful, put a little thought into what he will truly enjoy. You might also want to slip in a little note with the present telling him how much he means to you, just to give it a special touch.