• 1095 - Very high carbon, breaks if abused, good for hunting knives & skinners.
• 1084 - a little milder, simple carbon steel, good for utility blades.
• 5160 - spring steel, excellent steel, easier to forge than 1095 & 1084, good for big blades that need flexibility (like swords).
• O-1 - like 1095, not very flexible, excellent wear resistance.
• 52100 - found in many ball bearings and bearing races, excellent wear resistance and flexibility.
• L-6 - found in large woodcutting bandsaw blades, a good all around blade steel, looks great in pattern-welded steel, and holds an edge a lot better than nickel. L6 has a little silicon for shock resistance, a little nickel for wear resistance, and just a touch of chromium for rust resistance. Hard to break, easy to work

Admiral Steel L.P. carries all these steels, and quite a bit more. They also have a free catalog:

Another source: check www.cartech.com on the web, it's Carpenter steel's home page.