Dreamhost was great until early summer 2006. Then the problems started for real. Power outages in their data center revealed the fragility of their network. Sites were down for hours or days. Mail was slow or unreliable.

Fast forward to February 2007. A PLANNED power outage in the same building led to hours more downtime than expected. Dreamhost posted an announcement on their blog but did not mail customers.

Reliability -- the most important factor in choosing a web host (after price, for most people) -- has suffered greatly in the past year. I cannot recommend Dreamhost as of early 2007.