Hi, i have recently invested around 400 GBP in Flash MX books covering communication server, coldfusion intergration etc etc etc...Now i find that flash MX has been superceded by MX 2004, is this a major upgrade?

If i upgrade to 2004 are my books going to be still valid as i understand actionscript is now at 2.0, should i just sell them on ebay, swallow the heavy loss and invest in some MX 2004 books instead?

Thanks in advance