I haven't seen these on the market yet but they seem to be a really cool idea. Its a hard drive made from ram modules.
http://www.hardwarezone.com/articles/view.php?id=1725&cid=10&pg=1
I wonder if SL would see significant gains by placing the cashe in something like this.
Anyone tried creating something like a 1 gig ramdrive and putting the cashe on that? Hehehe. I am demented...