As a podcast fan, I've been aware of the Grammar Girl phenomenon for some time. If you're not, here's the scoop: it's a hugely popular website and podcast where grammar expert Mignon Fogarty (yes) gives her "quick and dirty tips for better writing". There's actually nothing dirty about it, it's just good grammar sense, delivered in a fun and intelligent way.
Which is probably why Oprah recently had Mignon on her show to explain the accept/except and lie/lay distinctions, among other points of English. According to Galleycat, the Oprah experience has created huge demand for the book Fogarty will release next year. To take advantage, she's mixed an audio version herself in super-fast time and it's available now via her site.
