Robbie William's Greatest Hits album would be sold not only on the CD media but also on MMC cards.
There are no details what capacity the cards would be or whether the audio will be compressed to mp3 or WMA format. Hopefully the audio would be in PCM format because paying £29.99 for an album - I would expect to get the best possible quality of music.
I am not a Robbie fan. However I think this is a great idea. £29.99 is a bit too much - but thats the way it is if you are an early adaptor. In a couple of years, prices of flash memory would drop drastically - probably making it cheaper than CDs. Hopefully by then we will see more content distribution done though flash memory. Movies will one day be sold in Mpeg4 or DivX format on flash media and be truely plug & play on mobile devices.
Source: BBC News