Here at MySQL, we make every effort to test and put out quality products. However, it is inevitable that users will find problems. When that happens you have several choices.
Mailing ListsMySQL has several mailing lists available covering a variety of topics. There are lists focused on cluster issues, gui tools, Java, .NET, Win32 issues, and others. And if you can't find a list that matches your needs, we have a general list. These lists are monitored by MySQL support personnel and developers and your question will often get a response very quickly.
The mailing lists can be found at http://lists.mysql.com/
ForumsFor those of you that prefer a more web-centric experience, you can use our online web forums. These forums cover an even more diverse array of topics and are also constantly monitored by MySQL support personnel and developrs. Our forums even include RSS feed and ATOM feeds!
You can find the forums at http://forums.mysql.com.
Paid supportAnd for our customers who require that extra level of support we offer paid support packages. You can find out more about those at http://www.mysql.com/support/