For the lazy, here's what I found,
Compelled speech: http://law2.umkc.edu/faculty/projects/ftrials/conlaw/compell...
Code is free speech: http://archive.arstechnica.com/wankerdesk/2q99/freespeech-1....
Reminds me of this xkcd: http://imgs.xkcd.com/comics/legal_hacks.png