I've been investigating jumpbox, who give you downloadable virtual servers that do one thing well - e.g. wiki, bug tracking, Wordpress, Joomla. It seems a great idea. Normally I don't blog about things unless I'm using them in earnest, but I thought I'd share some details here in case you can't find out how the pricing works.
I couldn't find much on the site about what you get for free and what you pay for, until I'd downloaded a virtual machine and ran it. When I got to the register page there was an iframe pointing to this product overview which gives you the overview of what you get for free and what you get for registering (which costs).
Basically if you pay you get backup, customisation and support.