Basic operation like bold, italic, bullets, attachments and links are simple using the buttons but how to add code, tables etc.

Some things I know:

• For code insert 6 spaces followed by the text
  This is the code
• For codebender you can just drop the url to your codebender page in the forum

But now, how to insert a table?

The help leads you to http://daringfireball.net/projects/markdown/syntax but trying a table (inline HTML) just showed me the HTML in the preview.

Any other tips?