Thank you all for your suggestions!
sambodhi: yes, I knew I would probably get recommendations for more than one book - I just wanted to see what everyone thought was the most important one, to each
I would also suggest reading Bhikkhu Bodhi's book again. I have it and have read it a little here and there at least twice. It's definitely worth a second look. I also would encourage you to look at the other resources listed above. There are ebook versions of accesstoinsight's sutta pitaka available (or they were the last time I looked). And the teachers who have written basic, simple explanations of the Four Noble Truths and the Eightfold Path have done a really great job of keeping things within the context of the Suttas, while developing an "accessible" piece of writing. The author I mentioned (Bhante Henepola) has a book called Mindfulness in Plain English
, which is available for free now and it is also a great introduction to meditation. I found these in the same threads above and they were worth the few extra minutes it took to dig them up.
All that being said, the most important book to me is still the one I mentioned in my first post on this topic:Eight Mindful Steps to Happiness
by Bhante Henepola.