Multiple URLs but same page - duplicate content??!

I tried without any luck setting it up properly (sh404sef and flexi). I have the same problem as everyone.

Here's something you guys can try if u want to keep in the id.

go to the sef_ext folder in flexicontent and edit the com_flexicontent.php.

open it up and delete this
" if (!empty($id))
shRemoveFromGETVarsList ( 'id' );"
around line 124

it will keep your item id in and create the link like

www.domain.com/category/itemname?id=#

it doesn't look too bad.