For getting forum threads ranked, which is best and why? site.com**/topic/**thread-title-goes-here site.com**/t/**thread-title-goes-here site.com**/**thread-title-goes-here I'd take comfort in knowing that SEOmoz uses the middle version, except that "q" is more meaningful to a human than "t".  The last option seems like the best bet overall, except that users could potentially steal urls that I may want to use in the future. My old structure was site.com/forum/topic/TOPIC_ID-thread-title-goes-here so obviously any of those would be a vast improvement, but I might as well make the best choice now so I only have to change once.