CSS3 offers a lot; essentially it can let you programmatically draw whatever you want fairly easily. While it's cool to see demos and fun things made with it, I'm about as impressed by most "look what I can do with CSS3" things as I am with "look what I can do with <insert graphical design software here>". That's not to say that neither can create amazing things; I'm just noting that since it's apparent CSS3 is quite powerful, it'll take more to impress me. Regardless, it's always fun to see these things :)