Found this on Cisco's website. Good High Profile overview of Spanning Tree Protocol.

http://www.cisco.com/image/gif/paws/10556/spanning_tree1.swf

This is not a comprehensive lesson, but rather an overview of the root bridge election and designated port selection process.

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That's a pretty helpful link...wish I had found that prior to getting the CCNA. I spent many hours reading different documentation on STP.