Shadows have been around since the beginning of CSS2, however the only browser supporting them then (and continually now) was Safari. Shadows can be applied in CSS3 to borders, images as well as affecting text as well.
Plurk Badges have been released to the Plurk community, awarded based on merit. These standard badges I have also detailed below, however, I wanted to play a little and so got to work developing the PLURK:CSS to add in a badge (or two) of my own.