I have been using slicehost for over a year. I think that they are a great company and I highly recommend them if you are looking for a cheap VPS to host something that you are working on where you want full control. That being said, with Google App Engine on the scene now I really have no use for slicehost, so I am canceling it. I am a hacker not a Sysadmin and I really do not want to become one. With App Engine I can just focus on the product idea and the code and not have to worry about deployment and scalability. So I am working on my next big product idea that I am going to run completely on App Engine, backed by GitHub of course.
More to come soon..
Carlos Gabaldon 