Why? I feel the current distros are always in my way of getting things done on my laptop. There are too many UI inconsistencies, too many hardware drivers that randomly fail, regularly switching between single and dual screens is error prone, and finally no clear central UI to customise the OS (dropping into the command line to edit a config file written in draconian script just to get a mouse setting to work is just not good).
I last did this in November when I tried Ubuntu 10.10 Desktop (64 and 32 bit) and the netbook remix. They lasted a total of 6 days.
All this assuming that the OS actually installs: Fedora just hangs on my laptop. Once I gave it a chance to work through whatever it was hung on by leaving it on overnight. No luck.
On the other hand, you'd have to pry my Ubuntu servers from my cold dead hands. I refuse to host on anything else.