1. Durrett, Richard, Elementary Probability for Applications, Cambridge Univ. Press, London, England, 2009. A concise presentation at a slightly higher level than this text.
2. Mosteller, Frederick, Robert Rourke, and George Thomas, Probability with Statistical Applications (2nd ed.), Addison-Wesley, Reading, MA, 1970. A very good precalculus introduction to probability, with many entertaining examples; especially good on counting rules and their application.
3. Olkin, Ingram, Cyrus Derman, and Leon Gleser, Probability Models and Application (2nd ed.), Macmillan, New York, 1994. A comprehensive introduction to probability, written at a slightly higher mathematical level than this text but containing many good examples.
4. Ross, Sheldon, A First Course in Probability (8th ed.), Prentice Hall, Upper Saddle River, NJ, 2010. Rather tightly written and more mathematically sophisticated than this text but contains a wealth of interesting examples and exercises.
5. Winkler, Robert, Introduction to Bayesian Inference and Decision (2nd ed.), Probabilistic Publishing, Sugar Land, Texas, 2003. A very good introduction to subjective probability.