One of the best break downs of the OSI model that I have seen today.
A Little frustrated with TCP/IP Protocols and Their Functions
Network OSI model Mehr
osi model - Google Search
IP-Networking: TCP/IP Architecture Model: 4-Layers vs. OSI 7 Layers
The most detailed OSI diagram I could find
The OSI Model – What It Is; Why It Matters; Why It Doesn't Matter.
Comparison Between OSI and TCP/IP Model
OSI model Definition from PC Magazine Encyclopedia