There is good documentation available at http://tumblr.github.com/collins. The documentation below is for developers or people setting up a new instance.
The most recent production build of collins is available here
http://www.youtube.com/watch?v=rEyoS-iofK8
http://tumblr.github.com/collins/#quickstart
http://tumblr.github.com/collins/#quickstart-prod
Copyright 2012 Tumblr, Inc.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Email collins-sm@googlegroups.com or see the mailing list archive at https://groups.google.com/forum/#!forum/collins-sm