A couple weeks ago I attended wordcamp sf, and got to hear some css heavy weights like Estelle Weyl and Chris Coyier present. Here’s a link dump of some their presentations as well as some resources they recommended:
http://css-tricks.com/conferences/ConvergeSE2011Pseudos.pdf (Chris Coyier’s hilarious presentation on :after and :before)
http://iestelle.com/wordcampsf (Estelle’s super awesome presentation, great overview and demo of almost everything css3 can do)
http://jsbin.com/super-css-super-challenge/
http://css-tricks.com/9516-pseudo-element-roundup/
http://www.standardista.com/css3/css3-transform-property-and-the-various-transform-functions
http://css-tricks.com/examples/ShapesOfCSS/
http://nicolasgallagher.com/pure-css-gui-icons/
http://www.slideshare.net/saracannon/responsive-web-design-wordcamp-san-francisco