IFE is nice but I'd rather have power outlets. I bring TiVo'd TV shows on my notebook computer to watch in flight and the limiting factor is battery life. The power would also work for DVDs on computers or dedicated players, video games, etc.
I second this! The wireless is great and I'll probably end up buying it (if it's priced right) more often than not just to get more work done. Adding a power outlet in certain seats (like AA in coach) would be a huge benefit, allowing you to work longer and not have to worry about carrying an extra battery.
Now, it would be really cool if I could hook in to my slingbox from the plane.