does Google penalize you if you have the regular URL like url/showthread.php?t=3333 and the mod rewrite URL url/t3333-this-subject-in-rewrite.html that points to the same page. Is this duplicate content?

The reason I am asking is my forum is not indexed on 2 of my sites and is indexed OK on another one. I was wondering if this mod would hurt indexing when google spiders through the non-rewrite urls.

This works like a dream, but I'm curious if all you guys knew how to tweak the .htaccess file. I actually took the guts of the .htaccess from a post on the front page of this thread. From the looks of this thread, it seems this script actually writes the .htaccess file for you and all you do is copy and upload.

Does this script write the .htaccess reg exp code for you? Or is everyone but me a regular expression expert?

<added> and I still don't quite understand why the "new post" page can't be done...I can understnad why the "last post" can't be done, but you'd think the "new post" page could at least be done as the urls there are: showthread.php?t=####

Or is there a new upload and I haven't figured out how to get it?

Yes duplicate content will get you some issues with Google. BUT there is a solution. Create or edit your robots.txt file to include your Forum's PHP Files.

This way only your SEO'ed content will be spidered.