This past week’s TechMail is Firewall MySQL with GreenSQL which talks about a really cool little application-level firewall that sits between your database-accessing code and MySQL. Really neat concept and although I’ve played with it a bit, I need to find some time to really dig into it as I can really see it being useful (especially in a web-hosting environment where you don’t really know what other people are running or whether they’ve upgraded, etc.).