To help kick off the new SVG community site, I thought I'd write up a tutorial and post it there. It's a quickie and it's maybe a couple years out of style, but it's got some pretty pictures: Gelcap Buttons in SVG. (Some people call these 'aqua buttons').
Disclaimer: The PlanetSVG website is still largely under construction, so please be gentle. Rob is working on a Drupal theme and we still have to plan out the overall flow of the site.