Hmm.... Tried Linuxwireless.org (or .net maybe) ?
There *are* some sites dedicated to wireless devices and Linux, but I don't recall the exact URLs. You'll hafta search a bit. Google is your best friend in this area.
Also, Newegg tends to have a pretty good customer-reviews section. Maybe there have been some Linux users who have posted their success/failure stories on newegg?
Other than using Google, or getting some feedback from a user who happens to have the same device, it's hard to tell what is in them for a chipset.
The name 'Rosewill' rings a bell for me though.. I cannot recall where/why I heard of it, but if it occurs to me I will post an update.
UPDATE - for the heck of it, I Googled "Linux Rosewill Wireless" and got no shortage of results, some of which looked POSITIVE. Check it out
