[makkonen]

MCC/MNC must be left as 310/995 or the APN will disappear. I think I mentioned this before here -- if not, there it is. The rest of the settings can be tweaked, but the device reports itself with that MCC/MNC, so will only show APNs with the corresponding values.

Facebook/pandora/google voice not showing up in the market comes down to the way Android reports resolution. If you go back to lcd.density=210 they might show up again (but use a fresh data.img). There's a hacked version of the market (made for Tattoo users) that shows everything, but it suffers from the old problem with downloads never starting. More on this as it comes.

I've noticed instability when messing with the APNs, but I don't know where it comes from. I haven't played with the new build enough to see if it's significantly less stable for me as well. If so, it's either something in the rootfs or the kernel -- and neither seems to have any obvious changes that would cause a problem.