I have moved hosting companies again after a day long outage with no communication or updates from DreamHost.  This wasn't the first outage, but it was the worst, and although they gave me a free month of service as a result of their error (they deleted my apache configuration) it still didn't make up for it.
There have been ongoing issues with their service that a lot of people are complaining about on their blog, including the lack of notifications when updates or upgrades are being rolled out.  I was down for 6 hours while this happened as well.  
Now, I don't have mission critical sites, but I do have other boxes out on the 'net submitting data to these, and they get really upset if they can't do that.  
I moved back to WiredTree, which had awesome service, awesome support, but it was just too expensive at the time.  The funny thing is that when the outage happened at DreamHost, I looked at what I pay per month, since I upgraded to their Private Server program, and it turned out to be really darn close to WiredTree.  
So, here I am, moving things back again.  Hopefully all of the DNS changes and such will be done in the next couple of days.  Sorry for any broken links or problems you might have.