The title is probably too broad. The problem I face is that I am working on a beamer presentation, and because beamer conflicts with apacite, it has been suggested that biblatex be used instead. I have tried it but there are a few issues.
1) Full list of authors the first time, but uses "et al." in all subsequent cites, e.g. first time: (Doe, Smith, & Johnson, 2009); 2nd time and on: (Doe et al., 2009)
2) No comma between the authors and the year. How do I make it output something like (Smith and Johnson, 2009) instead of (Smith and Johnson 2009)?