I'm happy to tell you that I'm writing this reply on my new MSI RS480M2-IR that I installed last Wednesday. This particular board is loaded with features and is a very stable platform for a value-oriented Athlon 64 socket 939 system.
The Radeon Xpress 200 integrated graphics processor is hands-down the best on-board video chip I've ever seen, as well. Full DX9 support and very playable framerates for all but the absolutely most demanding games as well as terrific hardware assist for DVD playback are all welcome surprises.
Several other motherboard vendors have products anounced that haven't come to market as of yet:
Gigabyte's GA-K8A480M-9
ECS's RS480-M
TUL's A480A7
Sapphire's A56
ASUS' A8AE-LA
As we've seen repeatedly over the last few months, announcing a new product and actually delivering it to market are two entirely different things.
Judging from the MSI RS480M2-IR's initial stability and value, I think the Radeon Xpress 200 chipset has a very promising future ahead of it. OEMs should be snapping these boards up for inexpensive, high quality Athlon 64 builds.
The MSI RS480M2-IR is a fantastic motherboard for anybody who appreciates quality and value. If you're not an overclocker and you don't consider spending $1250 for a motherboard, 2 video cards, and a 530-watt power supply to be a good investment, the ATI Radeon Xpress 200 platform deserves a serious look.