These are the slides from the OCaml presentation I gave in class.
The official homepage of OCaml. Go here for general information about the language and to obtain a compiler.
This site contains the official OCaml documentation. It has a technical specification of the entire OCaml language, which isn't really that useful for a beginner. The Objective Caml library reference, however, is very useful. For someone learning to program in OCaml, the core and standard library should have most of the modules and functions you need.
This is an HTML version of an English translation of a French book on learning OCaml which happens to be excellent. It is a great introduction to both OCaml and to the concepts of functional programming. The book goes in depth with both the imperative and functional features of OCaml, highlighting the differences between the two. The first few chapters are great for beginners, and it goes into quite advanced material later on. I found this book to be a great resource when I was learning OCaml.
If the French book is too long and in-depth for you, this tutorial website offers a gentle and concise introduction to very basic OCaml programming. It covers many of the cool features of OCaml but there are also a lot of important things that are missing from these tutorials.