Question: I'm looking for a book that isn't too dense and that is usually recommended for someone who wants to learn of the mind/consciousness but doesn't know where to start.

Answer: 
I would wholly recommend Susan Blackmore's [Consciousness](http://rads.stackoverflow.com/amzn/click/B007PM2LW6). It's part of the Very Short Introduction series, not as expensive as Blackwell's, and takes you through just enough history to help you understand what the relevant issues currently are. If you're interested in reading further, just check her citations and go from there. 

Also, a good essay to start with is always Thomas Nagel's "What is it Like to Be a Bat?" which you can [easily find online](http://organizations.utep.edu/portals/1475/nagel_bat.pdf). Hume and Berkeley are worth reading, but they're a little removed from the current state of the debate on minds and consciousness. If you want something that's not dense, but you're not afraid of a longer read, there's also Stephen Pinker's [How the Mind Works](http://rads.stackoverflow.com/amzn/click/0393334775). It's a fairly strong Functionalist account of mind, but it doesn't pretend to have all the answers.
The most accessible book I have read on consciousness was The Mind's I, by Dennett and Hofstadter. It was a series of science fiction short stories that illustrated various thought problems in consciousness, followed by the two authors discussing the implications of the story. For someone just getting their feet wet in philosophy, it is a great easy introduction. 

The best single book on philosphy of mind I have read is Blackmore's A Very Short Introduction to Consciousness. It is VERY SHORT, with very clean writing. It is also focussed on compiling the evidence that has a bearing on the viability of consciousness theories. Blackmore takes one through this evidence, and with a general dialog between dualism, materialism, and her preferred delusionism viewpoint. Blackmore would probably be best read after one has at least skimmed a general overview book on philosophy of mind, although one could read her first, then the overview second.