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Let's start with an abbreviated Biography of Mendel, and a discussion of how Mendel's life interweaves with world events.
For those who want to know more about the man and his contributions, MendelWeb is the complete source site for everything to do with Gregor Mendel, his work in plant hybridization (you can read the original paper!) and commentary on Mendel's work by other noted scientists.
But, If you just want to obtain more information on the pea experiments themselves, and their relation to basic genetics, The Biology Project: Mendelian Genetics offers host of tutorials and self-testing problems basic genetics, while:
Practice Problems for Mendelian genetics will give you some simple problems, with solutions, which you can use to test your understanding of basic Mendelian genetics.