My RiscPC was getting full......until I used an old unwanted W2K machine as a central file server using a USB2 external hard drive. Now I play all my music on my RiscPC over the network from that drive. All my photos are also on the drive.
This has the advantage that you don't need a large drive in your main machine and that all your music,photos, documents etc are centrally available to all machines in the house (RiscPC + 2 XP's). Oh and one printer as well.
With a multi port switch I use once screen and one keyboard for my RiscPC and the "server" when I need to. Useful for flipping over to access a web site that can't be accessed properly under RISC OS.