How do I get a ROM onto my ICS (Android 4.0) tablet?
There's probably tons of ways to do this, but here's what I can think of offhand:


If you have adb set up on your computer then use it to push the ROM file over: adb push /path/to/ROM /sdcard
Upload it to Dropbox, Box, or any other cloud file storage service and then download it via the associated Android app
Upload it to a file sharing service like Mediafire and then download it in your browser
If you downloaded the ROM from somewhere, visit that site in the browser on your tablet and download it directly
Install a file manager or other app that supports FTP and send it over via a wifi LAN connection (one example)
Try Kies Air - I think it supports wireless file transfer