>> Where can I download the latest MDAC 2.6 or 2.7??? And which version should I get? 2.6 sp1? 2.7 rtm? <<

Venelina has given you the URL where you can download 2.7. FWIW, let me add that we have run into compatibility problems after upgrading to both MDAC 2.6 and 2.7. So hold onto your hat....

Mike