I'm thankful to have the Pentecostal library in Logos as well as a Century of the Holy Spirit by Synan and the Jack Hayford resources. There are so many yet to add!
The Fire Bible
The Complete Biblical Library (Thoralf Gilbrandt, editor)
Pneuma (journal of Pentecostal theologians), and no, it's not an oxymoron [:)]
The current General Superintendent of the AG has written a fantastic devotional on the Psalms "A Psalm in Your Heart"
The Flower Pentecostal heritage center in Springfield is collecting numerous works from the early 20th century pioneers btw
Assemblies of God Heritage which chronicled the early Pentecostal movement
Dictionary of Pentecostal and Charismatic movements, by Burgess and McGee
the list goes on, what other Pentecostal/Charismatic resources should be added?