Where can I find more information about Series 45 software. What are the exact differences between Series 40 and 45?

The only differences I can find is that Series 45 phones have a bigger display (128 x 160 pixels) and support for 3G networks (WCDMA). It has evolved form Series 40.

http://babelfish.altavista.com/babel....html#series45

I can't find any info on the English Nokia forum!