MySQL mini-FAQ

I've spent some time reading about MySQL and the JDBC driver, and here are a few long-standing questions that I found the answer to:

1. What is the difference between org.gjt.mm.mysql.Driver and com.mysql.jdbc.Driver?
   
   - They are the same, the former extends the latter with nothing but a no-args constructor for backwards compatability.
   
   
2. What is the difference between MySQL Connector/J 3.1.x and 5.0.x?
   
   - The 5.0.x version has support for XA (distributed) transactions.
   
   
3. Where can I find a reference guide for configuring the JDBC driver?
   
   - Here.