Nice article Sarah, thanks. Another advantage of Github is that you can make branches.

I host my plugins on both WordPress.org and Github and use the latter to develop the next versions on. In the WordPress Repo I also mention explicitly that I only offer support via Github, not on the forums there. Some people don't like that (the comments I get is "yet another login"), but it just works much better for me.

Although I am aware of their existence, I haven't yet used any of the git to svn scripts you mentioned in the article. Must check them out again now.