CSS3 has loads of new effects to help beef up your designs with less work. Though the new styling features look neat and easy to implement, it does not necessarily mean they should be used all willy nilly. Just like Photoshop default effects, be careful of their use and make sure they are relevant to your design.
One particular CSS3 technique, the letterpress, embossed text effect is so, very cool right now and can be achieved by using the text-shadow property (see Line25’s Tutorial Create a Letterpress Effect with CSS Text-Shadow). I recommend that you keep this effect to headlines and short amount of text because instead of looking cool, it can be visually jarring similar to print text with incorrect registration. Be aware that by limiting and properly using this effect, you can increase readability and decrease eye fatigue.