90nm chips are industry-wide stumbling blocks - even for Intel - so Apple's chips won't get much faster any time soon
Apple have the best displays - rivals actually buy their discards. They've revamped the 23" and introduced a new market-leader: the 30" flatscreen monitor. 4.1 megapixels, and powermac only as it needs new dual-DVI graphics cards to drive it.
OSX - 12 million people using about 12 thousand OSX-native apps on it.
Tiger - new OSX
Features: 64-bit unix, spotlight searching (sort of natural language querying for files), h.264 codec for high-def video (inc. iChat), RSS feeds in Safari, Core image/video, dashboard for common widgets, Automater (visual scripter).