I've got the same unibody MBP, and I was considering the same Corsair SSD from NCIX/Newegg, so I'm really looking forward for you to post the stock HDD benchmarks using the same computer and same software.
The question is, is it really worth it @ 4x the cost of a Scorpio/Momentus 320GB 7200RPM?
It's a solid state harddrive, or SSD. SSD's are the next big thing in notebook computers because unlike platter-based harddrives, SSD's do not have any moving parts. Also, in a lot of different benchmarks and personal experiences, SSD's give incredibly fast read and write times.
It seems that with all of the advanced hardware available today, the bottleneck of a computer system is the harddrive. SSD's seem to eliminate that bottleneck. The only caveat to having an SSD is that at the moment, they're pretty damn expensive.
I hope I answered your question, and I am sorry if you were asking about something else; I don't mean to insult you if you already knew what an SSD was.