I know this isnt exactly answering your original question, but if you're looking for a fast USB stick that has U3 on it already, I'd recommend the Sandisk Cruzer Titanium. I got the 2GB model for my brother in law and he is very happy with it, and when I saw it all in action I was quite tempted to get one for myself! Yup, it's not as fast as the Rally2 but it's pretty darn quick. Even further down this tangent, I'd mention that the Sandisk one is one of the only models out there that doesnt have a cap, which is great cause we all know those get lost pretty darn easily for most people.
As for ready boost capability, I was under the impression any usb drive could do that.