Not being able to work at a desk, and: Intel Macs + Parallels = perfect for development
Anyway, now I can still be "in the flow" for long periods of time while working, and I am fine as long as my legs are elevated. I am also careful to take short 15 to 20 minute walks every couple of hours. Before this problem occurred last December, I often hiked in the wilderness behind my house for 8 to 10 hours a week, so I was surprised by the deep vein thrombosis. If you spend a lot of time in a desk chair, please be careful to exercise periodically during the day and not get most of your exercise just one or two days a week - I am writing this hoping to help other people not have the problem that I did.
Parallels: this is a brilliant product for Intel Macs. My wife talked me into buying a nicely loaded MacBook a few weeks ago. I had been happily using a Linux/Windows laptop but now use the MacBook for everything. Windows 2000 and Ubuntu Linux were easy installs on my MacBook, and both "guest" operating systems boot very quickly so if I need to perform a Windows or Linux build, or do some testing, I have fast access to any environment that I need for my work. It is also great being able to share file systems and the system copy/paste buffer. That said, I spend almost all of my time just working in OS X and tend to do quick 10 or 20 minute tasks under Windows or Linux, finish up, and shutdown the guest operating system.