SharePoint's FAST 2010 is not as cheap as you might think
However, make no mistake: FAST may be a lot less expensive, but it's certainly not going to come cheap. Not in the least bit because implementing it right will still be an expert's job.
Drupal Gardens, announced last year and in private beta since mid-January, is Acquia's "Drupal-as-a-service" offering, based on pre-release Drupal 7 code. I've been playing around with it a bit, and it's looking pretty polished.