4.0.4
I have played around with a couple of 4.0.3 ROMs and had no problems with the market. As soon as I flashed 4.0.4 I had at least 3 apps that are invisible to my GN. Even the free Seesmic is invisible. All a see is the PRO version. I also have an app in my purchased que that says "Your device isn't compatible with this item " where the download button should be.
I was told by a developer that there were issues with the Markets check out code. Hope it's fixed in 4.0.5!