The new 15-inch and 17-inch PowerBooks have much higher resolutions on the same-size screens... 1440x900 for the 15" and 1680x1050 for the 17" laptop. 22% better battery life, and double-layer DVD burning. Doesn't appear that they've changed the 12" PowerBook at all; I was half expecting a 13" PowerBook HD, a wider-format screen. Wonder if that's still in the works but not ready yet.
The new Power Macs include dual-core capability. The Power Mac G5 "Quad" is dual processor and dual core. Should be smokin'. And, double-layer DVD burning here, too.
Also, cheaper 23" and 30" Cinema HD flat-panel displays.