I still plan to do a post on Frost dps for 3.3.3, but I'll have to wait a week to do it.
My raid is progressing into some of the more difficult heroic 25man bosses and needs me performing at my best, and we already have a frost DK for the buffs. On 10-man, I'm having to tank for now - although after reset I may be able to go back to dps. When that group has settled in a little more, I may be able to go frost for more than 5-man heroics.
Comments on this blog and elsewhere have certainly been positive, and my guildies going frost have done well. I've seen claims that it may beat out unholy for dps but I haven't seen that quite yet, while it's apparent that it is competitive.
I look forward to giving frost dps a try, it'll just have to wait a week.
Also, thanks for the comments on the Cataclysm preview. I'll try to remember to address them this evening. I was out of town over the weekend.