I wonder how much input he's really going to have. His endorsement is probably going to bring them quite a lot of value (I used to watch Two and a Half Men and he was regularly using a MacBook - switch that for a Lenovo product and they're getting a lot of free marketing). I remember trying a Twitter client he was part of creating once and it was pretty bad.[1]
[1] Someone else owns the domain now but I was able to find this: http://web.archive.org/web/20111011125847/http://www.aplus-a...