I am a Mac guy and I use this service for my work. they are Mac based so I do not have to think about anything too complicated :-)

I like Engine Yard because they specialize in Rails Hosting. I also love the cloud concept :-)

I have highlighted the question :-)

I love the simplicity of 37Signals applications. It is based on Ruby On Rails and they have a terrific outlook on Web Application design and running a business.

I am getting into web programming and eventually into this technology :-) I think SaaS is the way of the future and SproutCore makes the browser-based web application a better experience!