For people with a Asrock 939 Dual SATA2 you are going to be happy !
As some of you know Asrock has future proofed its product for the new AM2 processor.
It will also sport 4 ports for DDR2.
Here are some pictures of this infamous daughter board that will support it.

On these pictures the daughter board is used on a 939SLI2-eSATA2.
But the 939 Dual SATA2 is the same.
This board will work on both.
- Images from HKEPC Hardware
Available as of now !
On the asrock website.