Hard disks are cheap and greatly ease the past pain of having to manage free space, but that’s not the case for me: I have a small-ish Crucial C300 128GB Solid State Drive as my C: volume in my work laptop. It’s been absolutely awesome for working with the various VMWare virtual servers I deal with on a daily basis. The speed on the SSD goes to 11.
The only downside is I have to be very careful about free space on the SSD. SSDs need breathing room to deal with various low-level things (go read Wikipedia’s article on them for a great overview), so I try to keep things fairly tidy and clean up unneeded files regularly.
You get an easy to understand UI with clear indicators where your space pain points are.
Besides, I’m a tool whore and this is yet another great thing for me to play with.