Anyone has tried the vista rc1 and also the speedboost feature?

Good review . But maybe you can try to elaborate more. For example, you mentioned that you encountered problem with your D-link usb wireless adapter, further description might be helpful and maybe you can also provide what you had done to rectify the problem so maybe users who may encounter similar problem might be able to solve the problem in the same way as you.

Yes, that's the main point with readyboost, provide smoother interaction without the need to get more RAM, but with RAM prices as of now, I think upgrading to more RAM is a better choice.

Mine is 4.9 also. You can try to delete the hibernation file which is allocated by default unless you want to use the hibernation, that will probably save the hard disk equivalent to your RAM size.

I'm using Nero Lite if not mistaken. Size is way less than 200MB but I can't confirm which version yet as I'm currently in office.

Anyway Superfetch is not Readyboost. Regarding the improment, I've read comment that one guy can feel the notices by using a 4GB flash drive even when he's got 2GB of RAM.

I've not tested this feature yet as I can't seem to find my desired flash drive.

Well for a more comprehensive list, check HERE

Irenic with your hardware spec, do you notice any improvement at all when you use the readyboost feature? Any difference between 512MB vs 1 GB vs 2 GB?

Plan to get a flash drive for readyboost purpose so just want to get more opinions.