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First you should visit this thread: A Dropped Site Checklist [webmasterworld.com].
I'm in the same boat. I sent an email to google asking for reinclusion and submitted it...... I suppose we should wait a few weeks to see what happens before doing anything drastic.
I have a site that is PR5. In the last few days it show PR0, if I type the URL in the address box to access the site. If I click into the site from Google it show PR5....