activeco - 8:38 am on Aug 13, 2008 (gmt 0)
OK, I got the point :), but I am still not convinced with the two mentioned cases. I have never seen any technical or canonical problem either with the tld's trailing dot or with the domain name in directory or file structure.
I have noted a few listed links where the default handling of the query string was tried to be abused, but couldn't see any effects in SERPS.
Something like [webmasterworld.com...]