More Devices!
I honestly think that Apple can show Windows users that the grass IS greener on this side of the fence. By continuing to develop more devices that can all comunicate with eachother, I think Apple can show a Windows user everything works with each other.... I think if they do this, they can get Windows users to migrate over to the Mac universe gradually.
One way to do this, I think, is by leveraging AirPort a lot more, and I think with the introduction of Rendezvous, we're going to start to see this.
Something that's been on my mind for a while is an Apple car stereo. Think about it... as long as your car is within range of the base station, with rendezvous, it would just show up in iTunes - just like an iPod. You could create and manage playlists, add and delete songs. Sweet Jesus, that would be awesome. Add a firewire port in the front of the stereo, and now you can update and transfer music or files to and from your iPod.
Then we've got QuickTime 6. Now I haven't used the beta yet, but from what I've heard, it rocks. Think of the possibilities with some sort of set-top box. You could have your entire mp3's library streamed from your Mac. You could record live TV, and then save the recordings to you Mac. Hell, you could then send those videos to someone, or post them online via your iTools account.
Devices like this are what I think Apple should be focusing on. "Non-computer" devices that really make the Mac the center of your digital lifestyle.
Edit: Let me clarify a bit more...
The stereo would have an interal hard drive... just like the iPod. Ideally it would have a radio, equalizer controls, a large screen, an intiative interface, and all of the standard features found on other mid-to-high range car stereos. I'd like to have a firewire port in the front of the unit so I can plug in my iPod and sync with it, or transfer files to and from it (so I can take a playlist with me while I'm shopping or something like that). I'm guessing that the unit would have to be removable so people could plug it into their Mac and upload and manage music on it... but idealy, you would have to do this, and it could all be done wirelessly.