I like using DocBook. I am probably one of maybe seventeen people on the planet who can say that and mean it. (I even prefer to use vim instead of a wizzy XML editor.) Somehow, I managed to get through school mumble years ago without getting seriously into TeX. I'm not fond of it to this day because writing in TeX feels like I'm programming, not writing a document.
My TeX installation of choice is teTeX, and it works on all *NIX operating systems I come across on a regular basis. (Many thanks to the TeX-heads who make this possible). But I'm still not entirely thrilled using TeX. On Mac OS X, however, it's not all bad. I use TeXShop when I'm writing or converting tex documents, like the source files for The Perl Review.
Setup and configuration wasn't exactly seamless, but it was relatively painless. I set up a new installation today from scratch. I started by copying TeXShop into ~/Applications, and it worked fine, except that it couldn't typeset anything.
Still no love. A quick spin through the TeXShop preferences, and I found the problem. It was looking for pdfTeX in the wrong location. After I reset it to look for pdfTeX in
TeXShop works with teTeX and a couple other Mac OS X TeX implementations. And, yes, TeXShop is open source software (GPL to be precise).