SSDs are fine, but some people need space on the road!
I for one have both OSX and windows on my computer.
A window 7 installation takes 14GB, with no applications!
To have some space for application you need at least 25GB for windows.
My iPhoto lib is over 10GB as well, iTunes lib is 100GB.
With applications and whatsoever no games or anything "fun" installed I'd need at least 160GB!
Some might say I could have iTunes and iPhoto media on another drive, but it's inconvenient.
The day I can get a SSD that's 250GB+ and cost less than $400 I'd might consider one.