Older LCDs have slow response time, so video and games could look smeared. LCD's do not have quite the color range of a good CRT, so CRTs are still better for graphics editing. LCDs are more expensive, but the prices are dropping quickly. There's also usually just one native resolution for an LCD; any other resolution used will look lousy.
CRTs are heavy, bulky, and throw a lot of heat... something to think about as summer approaches. They also use a lot more power.
Tom