If you remove this line
RewriteRule ^(?

The 500 Error go away, but you lose your CMS
[Sat Jul 31 00:20:36 2010] [error] [client 188.93.10.56] Request exceeded the limit of 10 internal redirects due to probable configuration error.
Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace., referer: http://web-sniffer.net/
Thats the 500
As google is already indexing the new file structure from the .htaccess file i cant really go back to the standard one so i left the CMS off! till a fix is found.
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