This is just staggering! 8gb in such a small form factor is incredible. I was very nearly tempted into buying an Ipod... but this seals it what is the point when I can have 8gb of memory on my mobile!
See Jasons blog for a bit more info http://blogs.msdn.com/jasonlan/archive/2007/12/12/8gb-microsd-available-now.aspx
Looks like they are currently going for about £55. bargin when you consider thats how much you pay for a 1gb Nano.