MySQL and Oracle
Monty Widenius, the creator of MySQL, needs your help to save MySQL from Oracle. In short, Sun bought MySQL. Oracle wants to buy Sun. Get the picture? Oracle has already let InnoDB languish after acquiring it. There's no doubt that they would like to do the same thing with MySQL. After all, many companies look at the price of Oracle versus the price of MySQL and Oracle loses another sale. Oracle does not want MySQL to succeed.
Frankly, this might be a strange blessing in disguise as it could increase adoption rates for PostgreSQL. That being said, I support open source software, even if it's software which represents the Platonic ideal of a "love/hate relationship."