One of the best ways to keep all of your data in one place is by using a NAS. If you're not familiar with the acronym, it stands for Network Attached Storage and it's basically a network device for the sole purpose of storing files. They come in all shapes, sizes and prices. Iomega has just announced a new line of affordable NAS drives.
I personally just have an old Dell PC running a copy of FreeNAS to keep all of my files, I already had the hardware, and the software was free. Unfortunately it's a full tower, so it takes up a lot of room and uses more power than is really necessary. Iomega's new Home Network Hard Drives take up about as much space as a regular external drive, and will certainly use less power than a desktop.