TWRoO on 25 March 2008
I have about 1100 left, the major taker is the internet channel, which takes up about 300 in total (250+ for the channel and a further 50ish as save files)
I do have a 1GB SD card though which only has MP3 on it at the moment, and I won't mind swapping and changing files because my VC games don't get played that often.... so If it ever gets full I will just keep the most used VC/Wiiware games on the Wii and the others on the SD card.
