New to Limit SNGs

[outofstep]

I've been playing .5/1.00 full0ring Holdem for about at a year now with a very successful winrate. I would like to switch to playing SNGs now, sticking to limit hold'em of course.

Are there any helpful links or books to get me started?
What are some key differences that I need to recognize and change from .5/1.00 to SNG transition? What aspects of the game should I now focus on?
Thanks for all the help.