I just discovered Paragraft, a text editor for iPad and iPhone which boasts some ingenious Markdown features (if I've lost you already, check out the TUAW Markdown Primer for a crash course).
The good parts of Paragraft blew me away enough that I'm able to overlook an ugly icon and some bad interface decisions to deliver a fairly glowing endorsement: this is the first app I've found that has really allowed Markdown on iOS to make sense.
There's no shortage of Markdown-enabled apps on any Apple platform right now, and I love that. I love Markdown, and while it's far superior to writing HTML or dealing with Rich Text in an iOS envi