I actually use to use a RAID 0 on my system -- till it started screwing everything up (something corrupt kept me from defragging, or fully doing disk/virsus scans, doing complete surface scan CHKDSK, etc.). On top of that, performance had a marginal, real world increse, and in fact, most of the time, I seemed to take a perfroamnce hit. The best thing I did was upgrade to a single 750GB 7200 rpm drive (replacing the two 300GB RAID 0). I couldn't even clone the RAID properly for replacement. I spent a weekend searching for a DOS-based cloning program. Found one and it saved my life.
In the end, for me, I will stay far FAR away from EVER doing another RAID setup.
So, I'll see how the SSD works for my scratch disk. Hopefully, it'll give me a bit of a performance boost in the end. I'm even thinking of replacing one of my "digital wallet" 80GB drives with an SSD, if the unit works in my desktop.