Hopefully this will help:
http://wiki.contribs.org/DAR2I've put what I know into that contribs page. Please feel free to add additional links and notes as appropriate (including the source rpms, if they are of interest). Hopefully, if anyone notices the contrib being updated, then they can update the WIKI page. Would be nice if that could be automated in some way, perhaps setting an 'external watch page', if there is such a thing.
I know istallation of dar2 is much easier since SME Server 7.1, because I there were many more unsatisfied dependancies in 7.0. I can't remember what they all are, so cannot document them, but I've added a note.
I also have stated in that page that there is no yum server for this contrib, but I have a feeling I may be wrong there, because when I ran 'rpm -i' on the contribs, it downloaded some updates for the contrib from somewhere (unless it was just the local files, and I was reading it wrongly).
Dunno where the trolling is - not here so far as I can see. From my POV, I only want to close the gap between those who know what they are doing and where things are, and the likes of me who keep coming at this with fresh eyes and see everything spread out like a jar of peanut butter on a whole loaf of bread. Yeah, okay, wierd analogy...
-- Jason