No access to Android Market after loading Ice Cream Sandwich
If you built the image yourself then Google's proprietary apps would not have been included as they are not open source. The easiest way to get them is probably to just use the CyanogenMod9 gapps package, which can be downloaded here (top of the table). If you have a custom recovery image then you can simply install the .zip file from your recovery, otherwise you'll have to manually install each of the files in the .zip (they have a folder structure that mimics your device).

The reason why the web Market isn't working is because it tries to use C2DM to push the app to the device, but this requires the Market app to be installed on the device. You cannot download the .apk from the Market manually.