It is a pretty basic trick to get an idea of people that are linking to your site.
Their VPS plans are a reasonable deal, but, as always, the support is what is always most important when choosing a host unless it's a super small static site, in which case the big guys like mediatemple, dreamhost, bluehost are fine. (Oh and check wordpress.com if you need a free site.)
Here's the stuff that makes me a happy programmer this weekend:
The blocklists are just put it right there in that same block in main.cf. I typically use four of them.