The problem with Scalr is you need to run several EC2 instances...if you can afford that (and need that) you're probably cool paying $500 for RightScale's fee service.
Looked at it again today and not seeing much activity, even on the Intertubes.<p>RightScale has been getting plenty of activity, though -- so it's a bit surprising.
link? it is not scala i presume since noone corrected the spelling.
aha:
<a href="http://code.google.com/p/scalr/" rel="nofollow">http://code.google.com/p/scalr/</a>