I'm curious as to why this isn't currently done but you should redirect VBForums.com to www.VBForums.com otherwise you effectively split your search engine presence in half.

For example, you may have 20 web sites linking to http://www.vbforums.com/showthread.php?t=500913 and 30 websites linking to http://vbforums.com/showthread.php?t=500913

To search engines, those are two seperate pages and are treated as such. Now if you combine them, you'll slowly weed out all the non-www versions and have only the www versions. So, theoretically, instead of two pages sharing the amount of linked sites, they're combined into one thus making their ranking higher.