here is a very awesome introduce artical from Microsoft technet website. you should read it if working in a big IT enviornment. here is the link http://technet.microsoft.com/en-us/ff472471.aspx
but to be a expert of FIM 201, you should have to be a skilled expert in SQL, MOSS, ILM, AD (include SPN, Kerberos, Certificates), Exchange, Sharepoint, Domino, .Net C# , .Net VB，Web Service,WCF , and etc (by XP). So this will be a very interesting part as i know. let’s start to learn FIM.