CNN.com reports that Arizona technical writer Mignon Fogarty has turned the sometimes dull subject of grammar into a popular podcast. Fogarty’s program, “Grammar Girl’s Quick & Dirty Tips for Better Writing,” has been explaining since July 2006 the finer points of grammar and language usage. Fogarty says that she got the idea for the podcast during vacation. Sitting in a coffee shop editing technical documents, Fogarty discovered so many grammatical errors, that she realized her expertise in the subject would lend itself well to a short tip-based program. Currently, the show is the 47th most popular podcast on the iTunes music store. At one point, it had climbed as high as number two…