Forgetting about things that pertain exclusively to the developer like code maintainability and religion wars about semantics and what-not, my question is: what real world problems does using tables present to the user? Are there device that cannot understand a tabled layout properly? Does it decrease the page's relevance on search engines? Of course I'm talking about a reasonable layout where tables are **only** used for things that in pure CSS/divs require hacks (and for tabular data obviously) -- not things like a hundred nested tables maybe even used instead of ul/li.