I am looking into Mosso http://www.mosso.com and am looking for feedback from folks who are hosting Drupal 5.1 with them. I talked to a sales guy there and he is asking permission from some clients to disclose a few that are running drupal so I know there are some.. It looks to be a solid option.
I have looked hard at Media Temple but they themselves told me on the phone they are still beta and have mySQL issues. So until they resolve things I gotta wait on them...
Any feedback would be greatly appreciated.