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Microblogging service Tumblr went down for a few hours yesterday. The outage cost the world several hours of vintage pinup girls and ironic reblogging. And it cost managed hosting service Rackspace a customer.

This morning, Tumblr founder David Karp said he planned to move the site to a new hosting services provider, blaming Rackspace for a "botched" firewall upgrade and decrying the "exorbitant price" his company paid for its services.

It's been a bad last couple months for Rackspace. When Web-based collaboration software provider 37signals went down for a few hours on Friday morning, it too blamed Rackspace. Rackspace retorted that the problem was isolated to 37signals. How reassuring to know that Rackspace's finger-pointing services are available 24/7.

Rackspace also went down in early December. And in November, a careening truck destroyed a power transformer, taking all of Rackspace's customers offline. But hey, before that, Rackspace was called the "most reliable" Web host in September 2007.