Nikon D300s Raw files not read

[Dwig]

Did anyone suggest just downloading the latest and greatest Camera Raw definitions from Adobe? Or does CS3 not support it?

As stated in earlier posts, CS3 does not support the newer v5.x versions of Camera RAW. Direct PS support for the D300s requires PS/CS4 and ACR v5.5 which hasn't been released in final form. There is a "release candidate" available.