[T2DMan]

With a non vbseo rewrite, you will need to make sure that the sitemap shows the rewrites. Be very careful using the vbseo sitemap as this will only list the old default vBulletin url's (unless you have customised the vbseo sitemap program)

All the rewrites that I have seen have very big problems. You should not be able to see the old url's at all on your forum. If you can see old url's and these are not 301 redirected to the new, then you have duplicate content, and you are losing out on Google PR and link text value to those pages.

vbseo is the only rewrite that I have seen that does a 100% job (apart from several sites that I have manually coded). In fact, with the new vbseo just out, there are just so many extras over and above plain rewrites, that it is well worth having a look.