Yes, resto druids are quite viable end-game healers. There are some fights where their HoTs are a huge contribution to a raid group. And, just in general, they are plenty capable of keeping up.
While I've only healed as a paladin, I've raided with healers of all the different healing classes. They each excel at slightly different aspects, but all are completely viable. I can't point you to specific gear, but I know from playing with several good resto druids that the gear is out there.
Edited, Jul 28th 2008 1:37pm by azwing