One of my favorite quick and dirty references for what's appropriate at what age is the PBS Parents Child Development Tracker at http://www.pbs.org/parents/childdevelopmenttracker/. Of course, I might be slightly partial since I worked at pbskids.org, but still, I've continued to use the tracker, despite leaving PBS three years ago. That must count for something.
One of the reasons I like it so much is because it's so comprehensive. For example, for three-year olds, you can look at guidelines for language, literacy, math, physical health, and social and emotional growth. (And note that I still left out a few categories.) It's just not your puny table that you find in a lot of basic child dev books.
Bookmark it. Use it well. But remember, they're guidelines... not absolutes!