Benefits of tableless design
To emphasize greater use of Cascading Style Sheets — there are few very good reasons to dump endless HTML table structures in favour of CSS.
Tableless design (or layout) is a design technique that leaves out HTML tables and uses CSS to arrange elements on a web page.
To illustrate the point let's introduce 2 different samples of fluid 3-column design: tables vs tableless.
Visually there's absolutely no difference. Yet technically speaking, for this very simple page in structure, you can spot a 5-line difference and approximately 200 bytes in favour of tableless design. That leads us to the benefits:
Bandwidth & rendering
Tableless design means less bandwidth. If you link in a CSS file, a browser will cache it on 1st load of a page and on further navigation only page structure itself is being downloaded. In addition to traffic cuts it significantly reduces page latency as well.
Prioritizing Cascading Style Sheets will also ease the process of porting a site to various platforms, e.g. mobile phones, handhelds, etc. or usage, e.g. printing. Not to mention making the site reachable for a screen reader or braille device.
With CSS site layout is kept apart from its structure and is centralized. That makes site design a lot easier to change. For example changing 1 single digit in CSS may increase or decrease font size of an headline on each and every page of a site.
CSS is a reusable resource as opposed to the inline definitions of HTML.
And for all tableless developers there are badges you can add to a site to indicate its quality: