Odds of Don/Danny getting together-ZERO. Still, I'm not knocking anyone who wants to ship them in a romantic way. Over at the House forum, there have been discussions about whether House/Wilson are more than friends so I have nothing against the same arguement applying to Flack/Messer.
I find it a bit ironic that two males who have a strong friendship can be mistaken for bi/gay but when TV shows depict strong female friendships, no one interprets them as being lesbians. I think that Don and Danny have a strong bond of friendship which makes their relationship fun to watch.