A very popular one that is very specific to toddlers is Taming Toddlers. It is quite good for : giving you a sense of perspective, tips on dealing with different types of behaviour, and seeing things through the child's eyes, although gets a bit repetitive and some of the advice seems a bit out of date.
This one is aimed at parents of slightly older kids (2-8) but I found that it set out the general principles of managing behaviour really well. More useful in the longer run I think. (I started reading it at a similar point I think.)
Edited to add that the second one is The Incredible Years mentioned in a few posts below.
Edited 1 time(s). Last edit was 2013:09:25:19:31:53 by cashewnut.