Interesting stuff about creating a SiteMapProvider on ‘Tomblog’ (but Tom who?)
Note 1 – I guess he inherited from SPNavigationProvider or SPXmlContentMapProvider as SPSiteMapProvider and SPContentMapProvider are both sealed.
Note 2 – He doesn’t mention caching. I kind of wonder how that would work.
Still, interesting stuff – might have a look sometime as part of my ‘one breadcrumb only’ campaign.