First of all: nice work!
Do you know how I can preserve newlines (not paragraphs) within code blocks? I tried the following: http://support.mashery.com/docs/customizing_your_portal/Markdown_Cheat_Sheet
Line Break To create a line break, end a line in a paragraph with two or more spaces.
This would be quite usefull for long commands like svn checkouts:
svn co --user me \ http://this-is-a-very.long/url/to_some_repo_I_wonna_checkout \ localDir/
Unfortunately, I end up with a one-liner in html right now.