I’ve been playing with MarkDown formatting for my plain text notes. MarkDown is a really lightweight markup language for transforming plaintext to HTML. GitHub and StackOverflow use it for their readme files and comments. When I need a quick HTML preview, Showdown has been a great preview tool.
MarkDown
http://en.wikipedia.org/wiki/Markdown
Showdown — Realtime MarkDown Editor (there are lots of these)
http://softwaremaniacs.org/playground/showdown-highlight/
MarkDownDeep.Net
http://www.toptensoftware.com/markdowndeep/
MarkDownHelper for MVC on NuGet
http://blog.dantup.com/2011/04/markdownhelper-on-nuget-using-markdowndeep
@Html.Markdown(Model.YourMarkdownPropertyHere)