im a happy SantaRosa owner :
What about the problem of network not working on the Gentoo install disk / vanilla Gentoo kernel?
yes, it didnt work here, i just copied all i needed for a minimal install to my usb-pen, built a modern kernel and did the rest after rebooting.
- wifi apparently works, but havent played much with it.
- i dont know what exactly you mean with "power managment". Hibernating / suspending doesnt work accurately here, tried stock in kernel and suspend2.
- i never had any problems here with the binary from nvidia or opensource nv driver - maybe im just lucky

But most known problems were fixed in the latest release afaik.
Two things that you didnt count :
- remote control - i dont know how to make this work. I thought it is supported by latest lirc but it doesnt seem to be even detected correctly.
- sound support, as of now, alsa has to be patched afaik. Havent playied with the microphone yet, but i dont expect it to work either.
cheers