Apple has pumped up the capacity of the Time Capsule, adding a 2 TB model for $499. The 1 TB version remains available, reduced from $499 to $299. The 500 GB Time Capsule has been discontinued.
The Time Capsule can host Time Machine backups on a local network, as well as acting as network-attached storage over AFP and SMB. The product also includes all the functionality of the simultaneous dual-band AirPort Extreme Base Station.
I've been down on Apple for a while for charging $499 for the 1 TB Time Capsule as drives of that capacity dropped to $100 or less, even with some of the same server-grade specs as those used in the Time Capsule.
The new price is in line with the value of a $179 AirPort Extreme plus a hard drive plus a little something for putting it into a single box.