As you know, SB Nation's Tampa Bay Rays Blog is DRaysBay, but you can get comprehensive coverage from a Texas point of view with the Rangers blog -- Lone Star Ball. Also take a look at SB Nation Dallas-Ft. Worth, who has a very good overall preview of the Rays-Rangers series - I highly recommend it.
You can also follow the series action from across the SB Nation Network with Rays/Rangers Game Coverage, and follow all of the MLB Playoffs on SB Nation.