It was in 2004 when I began the practice of using only one laptop for all my computing needs. Well almost all, because I still maintain a desktop PC for those applications that require extra oomph. This is especially so for processing volumes of raw images in Photoshop CS2 and for printing and scanning jobs. I also use the desktop to find my way around some 1TB worth of backup files in several daisy chained external hard drives.
Why only one laptop? Primarily because I always carry with me all the files, e-mails, images, documents, etc. for any current project or tasks, whether personal or for work.
When I go to meetings, because of this practice, I often beat to the draw anyone when it comes to having to get a file fast. When most would have to go back to their desk to retrieve a year-old file, I on the other hand can get to it as fast as they can say "EUREKA."
It is also practical to have just one container for all your e-mails, current project files, blog files, etc. rather than having to regularly sync your laptop with another computer. My standard practice is to only receive all incoming files in my current mobile computer - this is the MBK at the moment. Depending on whether I will still use the same within the next year or so determines if they stay in the mobile or become archived on the desktop.
This practice has been a productivity booster for me these past years. As such, I do not and will not change this anytime soon.
The MBK is configured as a desktop as soon as I get home. I use it for mostly everything except for when I need to do intense photo or video presentation editing. This is how my desktop MBK is configured.The chair is a very comfy La-Z-Boy recliner. The table is a DIY project I did two years ago. It is very sturdy considering that the materials where just scrap metal bought from a junk shop. It has to be sturdy to be able to handle the ViewSonic VG2230WM 22" Black Widescreen LCD monitor, the MBK and everything else.
I love this set up and I find that it has made my work in front of the computer not just bearable but enjoyable even. The monitor gives the "Technocop Command Center" some very serious real estate. At 1600x1200 resolution, it can easily fit two full A4 sized documents with enough space for iTunes, Adium, and Skype windows.
It may not qualify as an entertainment ride in an amusement park, but as far as I am concerned, it is close enough.