6 month penalty for using expired domain

One of my SEO experiments was with buying expired domains and use it for SEO purposes. I bought an expired domain late Dec 2005. Eventually the PR was Dropped and it was out of google's index. I wasn't able to develop that domain and so it just stayed there doing nothing.
Early July just a few weeks ago, I finally found it indexed by google. Counting back the month from the time I bought the domain, it seems like google has a 6 month penalty imposed on expired domains. Since it was late Dec, the 6th month was the latter part of June. It took a few weeks more for google to crawl the site and index it.
I can't really say that all expired domains go through this 6 month penalty, but in this one domain's case, it did.
Anybody had similar experience on expired domains?
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By Expiring Domains, April 20, 2007 @ 7:50 am
No my expired domains have great traffic from the search engines.
By casinomoz, April 10, 2008 @ 3:28 am
Hi there. I would like to say that I think you may be right. I bought the linked domain some time back and began developing a blog on it and building up content and incoming links.
It’s a month or two old now and still not getting any love from bog G when it coms to serps or indexing, even though I see that some of the articles have been added to stumble upon and a foreign site similar to Digg.
In the past, having an article in Digg was a sure fire way to get indexed in a hurry, but now, even after that, nadda.
I also now am wondering if this is an expired domain penalty or if the domain itself may have been put up for sale after being put under some other type of penalty.