More Google Sitemaps Odd Behavior

Listing my website on Google Sitemaps killed my listing(sitemaps is a new Google webmaster tool to aid Google in correctly indexing your site). First bestportlandrentals.com was removed from Google search results after I set it up in Sitemaps. I removed the sitemaps entry and in a little over a month, the search results came back. The same thing happened with portlandpage.com. Entered in sitemaps. Got de-googled. Removed from sitemaps. Re-googled.
Maybe there's something I missed. Google seemed to indicate I had made the correct entries. Could be my goof.
In the meantime, I would strongly caution any webmasters out in the world to think 2x before entering a Sitemap with Google.
google sitemaps de-list delist