I wouldn't want to do without a desktop, but I also like having the option of going to a coffee shop or park to work, especially when I'm having trouble staying on task at home.
The only problem with laptop is the small screen and it's harder (/more expensive) to do a multi-monitor setup. I don't know how people are listing an 11" laptop to do any dev work. I guess if its just a straight editor and not an IDE that works.