We are running out of storage on our Mac mini. With all of our music, videos and photos, we only have 15 GB available on the 120 GB drive. I was thinking could get a larger drive, like this Toshiba 200GB 2.5-in laptop drive, but that would only add another 80GB.
Another option is a network attached storage device. Slim Devices has teamed with Infrant Technologies to for a bundle with a 1 Tb Network attached storage device with 2 Squeezeboxes. I think that a terabyte would be enough storage for a while.