Apple announced a companion to Time Machine today, Time Capsule. Essentially a hard drive and Airport combined -- an NAS from your favorite Cupertino team. The wireless drive will come in 500GB and 1TB configurations, and will feature 802.11n, as well as server grade hard drives. They will clock in at $299 and $499, respectively (Steve says they're aggressively pricing them because they want everyone to backup). You'll be able to backup your notebook or desktop wirelessly from anywhere in your home. Available in February, pre-order now.
Apple Time Capsule