How long is amd going to put support for DDR2

Probably until the price of DDR3 drops to about £50 per 2x2GB which will be inbetween the end of this year and the end of next year.

All that's officially confirmed is until summer. Most likely the current chip line ups will continue to support DDR2, but once a new cpu comes out I get the feeling it'll be AM3 only.