Hm, I've been looking for a lightweight, language-neutral job queue. RDBMS-backed is my preference since I don't need massive scalability, but do want persistence that's easy to reason about (so not Redis), transparency (so not beanstalkd) and a long-lived history (so not most of the other ones).

But, RDMBS only makes sense if you can use your existing installation, so MySQL-only is a nonstarter.