What markup for tree of threaded comments?

What markup would you use as most appropriate for a tree view of threaded comments? Example: http://forums.dpreview.com/forums/read.asp?forum=1034&message=38217428 - just scroll lower below the message body.

I need to build a similar structure on a site and wonder what html tags to use for displaying the whole structure and individual comment lines:

  1. table, tr, th, td
  2. div
  3. ul, li - probably nested lists?

So far my inclination is towards tables as it seems the easiest solution and I can’t find any tags that would be specifically suited for this purpose. What are your ideas?

Nested ordered lists are more semantic in representation of a tree but a table seems more practical. I say table is fine here. You don’t need divisions either nested ordered lists or table.

Thanks, I will use tables then.