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I agree with Andy, just update your content.

Alan, On that note, do you recommend demoting the sitelinks via webmaster to get Google to replace it with the better optimized and relevant pages? or just let time do its thing Thanks

Thanks for the answer. However I'm still unclear on a few things so I thought I'd give some further info: We actually have two XML sitemaps - one for our main site including our forums (this sitemap is generated/submitted by a ruby on rails plugin) and one for blog posts and static pages (this sitemap is generated by a Wordpress plugin). The sitemap which is appearing as a "Top URL" is the first one There are actually no links to our sitemap anywhere on our site - the only way Google knows about it is because we automatically generate and submit it to Webmaster I think the reason that it is appearing as a Top URL is because all of the page titles of forum posts are listed in the sitemap, and this is the only page where they are all listed on one page. So I think you are right about the 'simple algorithm' thing, but I think it's because of the frequency of the keyword in the sitemap, rather than because the sitemap is linked to from anywhere on the site (because it's not). This brings me to a related question - is it bad having two separate XML sitemaps, and should I be linking to them somehow from the site?