This is One of best articles I have read on clustering.
Very complete, and provides info on just about every task we happen to perform
on clustered servers. Must have for a DBA, if any of your servers are clustered.
Download from here. Best part its a white paper provided by Microsoft itself :)
In case, if you want to read on how to install clustered sql server with some simple
screen-shots, you can also refer to embarrassingly simple article written by Brad Mcghee here.