Various teams across the company have created what are called 'microsites' aimed at recruiting, telling potential candidates what it's like to join Exchange. We did one too, as we announced on the blog. I am a huuuuge fan of our site (ok I helped a little in developing it) because I think it displays the culture of the exchange team pretty well, and I happen to think that the exchange team is a darn fun place to work. And oh yeah, the site's just plain funny, I still giggle even though I have been reading the jokes for two months.
There's also a thread on channel9 where it started out about the site and kind of turned into a conversation between me and a few active posters about Exchange, come join in if you want and I'll see if I can help out with anything (note: I'm not much use for tech support anymore as I don't get into that level of detail these days, but I can at least help with history and perspective on a variety of issues since I've been around a while and dabbled in a lot of areas).
 Unless you need help with outlook 98/exchange 5.5 TNEF & content conversion. I rocked that world. Don't forget to click on the lobster. One might ask... why do we feel the need to do that on a separate site? Why doesn't www.microsoft.com/careers meet that need? That is a great question. :-)