I can't believe I let my Mephisto-powered blog run on Dreamhost for so long. DH is great in how they provide super-affordable, reliable hosting with gargantuan bandwidth and space. They even support Rails quite well. The inherent problem is that my Rails apps take up about a gig of ram when they're all being served and I was making things unfun for the other DH customers.
Luckily Slicehost rocks so damn hard that I don't need to worry about that now. I'm serving all my sites on an 8-core AMD64 Gentoo system for less than half my monthly cell phone bill. So if you notice anything feeling snappier around here you can chalk that up to those barons of St. Louis running the Slicehost datacenter.