>>>Seems to me I should be able to get some information out of VISTA regarding the feature.
>>>I have a 4GB stick attached as all ReadyBoost and have no idea if it is effective or not.
>>>
>>>Anyone?
>>>
>>>Thanks
>>
>>Pull it out (use safely remove hardware) and see what happens. Vista will automatically adjust to not having it.
>
>Well the system has slowed down (as warned in MS documentation for SP1) so I guess it`s working s it should.
>But it peeves me that I can`t get some reporting about what it is actually doing for me.

I've never considered looking for performance data on the readyboost cache. I'd bet you could look in performance monitor (perfmon.exe - I think it is still in Vista but I'm on an XP box for the moment) and find some performance counters that are related to it.