If you work in any way with MySQL and do not have a free account on the company site for notifications and newsletters – you are missing out.
Yes – this sounds like a shill for MySQL – but it is unofficial. Simply I have found that aside from the expected marketing fluff to toss out once in a while via e-news, MySQL is publishing some excellent heads-up on products and usage along with some great tips on documentation deep with the site.
Recent newsletters have focused on version 5 – with fantastic in-depth links to how-tos with solid technical methods for setup, migration, tweaking and more.
Check out some recent newsletters here, and definitely sign up for notifications when registering as well, as some of the best material comes out on-demand in those communications.