Concordia Publishing House - The Missouri Synod's publishing house. An expanding collection of superb books, curricula, and supplies. Check it out.
Issues, Etc. - The best, most substantive show on Christian radio.
Repristination Press - a source for excellent classics of Lutheran doctrine and exegesis. Also the source for the Book of Concord containing the English text only from the Concordia Triglotta.
Mark V Publications - Pr. Joel Baseley's website where one can browse and purchase Pr. Baseley's translations of Luther and Walther as well as books authored by the man himself.
Table Talk Radio - Unique radio program featuring Pr. Brian Wolffmueller and seminarian Evan Goeglin.
Pirate Christian Radio - the home station of Issues, Etc. and several other excellent Lutheran radio programs.
Congregation Locater - are you travelling or moving and want to find a good liturgical congregation and avoid the crazy contemporary fluff that's out there? Check this website for info about liturgical congregations in the location of your choice.