The RTM SP2 is out for Vista, but now there is an issue with latest drivers.
I get very low signal with latest 1.50 drivers. Half the time it drops connection to the router. I bought a new card DWA-552 to make sure it wasnt my card that got cooked some how.
Then i did a fresh install of Vista on another HDD with only SP1 package. Installed 1.50 drivers, and now my signal is back to normal as to where it should be.
Dlink, its time to make new drivers.