Storage Area Networks for Linux?

angelo asks: "Many of us have heard the buzz (on the radio of all places) about Storage Area Networks, or SANs. They are a method of accessing a common drive system, backing up information over a second network, and collaborating a server farm. My question is this: Can you connect a Linux box to a SAN network? If so, which SAN products support Linux connection and administration? Do all channel cards have drivers, some of them, or is it "in the works?"