plug!(http://theskyisfree.com)

Instance management not as programattic as EC2.

Slice manager loving rocks.

browser based shell access rocks!

tutorials section taught me a lot about system admin and are easy for a web-devs to follow

Root access for $20 a month :)

Pros: Root, many distros, great support (was able to change slice size within hours, that may vary but it was fast). The web console, in case of ssh irregularity, is nice.

Cons: none yet, maybe there exist some but I've had no problems so far for about a year or so.