I found a great South Indian cookbook, Dakshin: Vegetarian Cuisine from South India
with pretty authentic recipes. For awhile now I’ve wanted to tackle this cuisine, and have slowly been building the culinary muscle to attempt it. South Indian food is predominately vegetarian, and involves lots of dal, masala pastes, idli, and dosais. (More on idlis later).
Most of the blogs and books you find on Indian cooking are from the Northern part of the subcontinent. Or, if it is a general Indian cooking website, there is usually no distinction between the different regions.