One of the best break downs of the OSI model that I have seen today.
OSI model: layers and corresponding protocols
Understanding this model is essential for anyone who wants to be involved in the field of computer networking. If you have forgotten the OSI model or just want to get a crash course in it, this cheat sheet by Ccna-security.net should help
The most detailed OSI diagram I could find
Comparison Between OSI and TCP/IP Model
Networks | Computing Educational School Posters
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The OSI Model – What It Is; Why It Matters; Why It Doesn't Matter.
IP-Networking: TCP/IP Architecture Model: 4-Layers vs. OSI 7 Layers