First off, great plugin idea. I'm using version 3.2 of Preserve Code Formatting with WordPress 3.3.1 and it works well.
I am writing this because I was thinking that a useful new feature would be on/off switches for all the filter areas (the_content, the_excerpt, get_comment_text).
Your plugin would work beautifully for my comment text, but I don't want it to filter my post and page content, since sometimes I use tags inside my
<pre /> tags.
Thanks for your time and keep up the good work :)