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http://www.mydomainname.com/blog/blog/29/blog/blog/blog/blog /blog/blog/blog /blog/blog/blog/blog/blog/blog/blog/blog/blog/blog/blog/blog /blog/blog/blog/ blog/blog/blog/blog/blog/blog/blog/blog/blog/blog/blog/blog/ blog/blog/blog/b log/blog/blog/blog/blog/blog/blog/blog/blog/blog/blog/bl

I'm pretty sure it's related to crawlers not respecting the baseurl tag.

Ah! That would explain why I see the same behavior with my Atom feed - the offending party is ALWAYS Google Desktop. -- Adam