1) Check out The Big Questions section for downloadable mp3 talks

2) Check out the following website which has excellent links (on the left hand bar) for questions related to Jesus here.

3) For more thorough answers to many of these questions, we recommend as starters such books as 'The Case for Christ', 'The Case for Faith', 'The Case for a Creator' (all by Lee Strobel), and 'Jesus among the gods' and 'Can man live without God?'  (both by Ravi Zacharias). However, the most recommended book is 'The reason for God: belief in an age of skepticism' (by Tim Keller).

4) Another internet compilation of many answers to tough questions is found here.
Despite the fact that we do not necessarily agree with everything you will found written there, it is a site that has helped many with its succinct answers.