ror hosting providers?

can anybody tell me some of the best ror web applications hosting
providers?

heroku

i know that heroku provides free hosting for rails application with
size less than 50MB, and also the domain name format is
xxxxx.heroku.com

but heroku provides the official hosting?

50MB is trailer you want host just purchase from http://heroku.com/

The major providers I know of off the top of my head are Heroku
(www.heroku.com), EngineYard (www.engineyard.com), and Rails Machine
(www.railsmachine.com). I believe both Heroku and EngineYard provide
"front-ends" to Amazon EC2 (in other words, what they provide is an
access layer to EC2 specifically geared toward Rails apps, to make
them easier to deploy and administer). Lots of rails applications
that I know of are hosted directly on Amazon EC2 or Rackspace Cloud
Servers, which are just straight-up virtual servers running your
choice of operating system. This approach gains you a lot of
flexibility, but it can be a pain to administer several different apps
on several different servers - keeping up with patches, making sure
that the system continues to work correctly post-patch, etc. can be a
full time job in and of itself! That's why providers like Heroku are
really useful.

If you're looking at virtual hosting, you can look at Amazon EC2,
Rackspace Cloud, Linode (www.linode.com), or Slicehost
(www.slicehost.com). There are lots of companies in the VPS
marketspace, but those are some options I can give you off the top of
my head.

Hi, I've only got experience with VPS so far. I've got mixed feelings
about ocssolutions.com, they were quite good at first (4 years ago),
but I didn't like their support in the long run, I've not used them
for a while so they may have improved. On my latest project, we had an
horrible experience with HostingRails, some of it were caused by
specific connection problems between their server and our region, but
overall it was a nightmare.

Finally we recently moved to SpeedyRails (speedyrails.com) managed
hosting and it has been amazing so far. Their server are incredibly
fast and the support is very professional. The only downside is that
they are quite new and their administration interface isn't all done
yet, but it isn't much of a problem with managed hosting. It remains
to be seen if they'll stand the test of time.