Here is the complete info:http://realfiction.net/go/153. The gist of it is that you create a symbolik link under %WINDIR%\System32 and %WINDIR%\SysWOW64 to point to either 32 or 64-bit oracle client depending on the bitness of a client app.

I'm leery of publishing some content which I didn't write on my own, but this one is worth mentioning. The Windows 7 RC Training Kit is invaluable resource for developer eager to learn the technology stack offered in the upcoming Windows 7: http://www.microsoft.com/downloads/details.aspx?FamilyID=12100526-ed26-476b-8e20-69662b8546c1&displaylang=en This kit includes a lot of different materials which will help you jump on the coding with the new platform.