Grammar Girl's Quick and Dirty Tips for Better Writing is an outstanding podcast for anyone who loves language and if you're at this site that probably describes you. The tone of the podcast is light without being superficial, informative but not condescending. Given the subject matter it may be surprising that this is one of the most popular podcasts but after listening to it you'll understand why.

Topics have included: "Neologisms," "Compound Possession,"Formatting Hyperlinks," "Asterisks" and so much more.

Site Link: Grammar Girl's Quick and Dirty Tips

Podcast Link:  Grammar Girl's Quick and Dirty Tips, Podcast