CSS
I've been programming for the web professionally for a year now and although I'm not completely switched over to CSS I suggest for anybody out there that is currently not using CSS to begin the switch. As I stated I haven't completly switched, I still use a mix of tables and CSS. The more I play and learn about CSS the more I use it. If your curious more about the power of CSS check out CSS ZenGarden. Its a collection of websites that use the same html source but different style sheets. You'll see just how powerful CSS can be with all the different designs.
Input Style - Putting CSS on form field.
Mozilla Scrollbar - This will take of the situation when in Firefox when you go from one page that is short to another page that is long, ever notice that the sidebar makes the page look like something changed on it it. This should take care of it.