I agree with Tycho. I've never experienced downtime that I noticed and have been mining for at least 3 weeks. So I hardly think your "daily" assessment is correct.
I've seen at least 10 down times in the last 3 weeks. Most were minor lasting only a matter of seconds ore minutes. There have been a couple times with 20-30 minutes of down time. This has been the longest so far, and thats why I moved. Once deepbit is backup, I'll use it as my "backup" pool if my other primary no fee pool fails.