From David Peterson on Conf-User:

When converting WYSIWYG content into Wiki content, put some optional whitespace back into it for readability. The main ones I would suggest at this point are putting a blank line in front of any headings (makes it easer to see sections in the page), and put a single space around table cell content (makes it easier to see where cells are divided). Eg instead of having:

Main Point

Sub Point

...have this:

Main Point

Sub Point