Exactly, Google and Yahoo have similar sitemap tools but I'm not sure if MSN do. And anyway, what evidence is there that sitemaps really help that much? There seems to be a constant flow of people expecting Google to index their site faster after implementing a sitemap, only to be let down.
So you think that a solid structure and good inbound linkage would have no effect? Yet you would rather rely on a single link? Everyone knows that MSN is pretty much in a constant state of flux ... I would be hesitant to place so much importance on one link.
Um...the high PR link gets visited fomr the SE frequently so your pages get indexed deeper and more frequently. You need good structure and a sitemap but links are better.