Currently, I have a razor cell phone, a 13" Macbook pro, and an iMac at the office. I video chat with my family more than I call them, but it's nice to have the phone for emergencies or when I don't have internet access. I use my laptop at home and when traveling, for both work as well as personal stuff, and I love having a big screen at the office. A desktop also forces me to work for extended periods of time. When I worked only on my laptop, I'd be tempted to close it and go home early, thinking that I could just pick up where I left off, which rarely happened. When I do need to work remotely, I can just ssh into my work machine and or grab whatever I need with scp.
The biggest gap in my current setup is a touch-screen type device that would be useful for reading papers or digital books. I'm not one to give up my paper books, but a lot of libraries, public and private, now distribute content digitally. Here's the hitch: I don't want to have just another gadget. Even if it's useful, I feel like so much technology overlaps already that an iPad/Kindle/Nook would be silly given that I already have so many things.
Here's the setup I really want:
1) A mobile device. I could make phone calls with a wireless earpiece or do video chat on this. I could read PDFs and other digital media easily without feeling like I'm using a traditional laptop. I could check/write emails, work on programing projects, and do other typing intensive tasks easily and for long periods. Imagine as if a Macbook Air and an iPad made a baby--this is that device.
2) A desktop/server. All my projects and digital media are hosted here. I can ssh in from my mobile device. It has a large screen that makes my daily work easy. It's powerful enough to do computation on large data sets.
Just two things. The second one already exists, but the first one doesn't. My bet is that it will sometime soonish, and when it does, I'll be ready.