1. This is an interesting compendium of articles, links and advice. It is quite thorough and will at the least enable you to navigate the Google Adsense Help pages and learn the basics.
2. I really like The Adsense and Kontera Earnings Advice blog because of the way the author understands his topic. It is very thoughtfully written, and covers in depth some of the areas in which a Google Adsense or Kontera Contextual Advertiser can polish and fine tune his/her advertising strategy and technique. Don't miss out on the articles in the archives!
3. Google Trends! A must have if you are creating content with the purpose of advertising with Google Adsense! Compare keywords, search hot names, titles, businesses and other trends to make your writing more effective!
4. Angellica2017 is the Google Adsense Queen! For some of the best practical Adsense Content, tips and advice, check out Angellica2017.com
5. The Google Help Group is a very supportive community where even a newbie can get the answers they need!
6. I learned more from this guys blogs when I was just starting out than I did anywhere else. Check out David's (www.o2smedia.com) Blogs and his site while you are there.
7. Google Tutor is a great resource for discussions on some of the more in depth topics, written by a variety of authors!

Hope this compendium of Adsense tips, tricks, advice and help sites will help you as much as it has helped me!