Turbine's official Dungeons & Dragons Online website has been updated with the developer diary written by David Eckelberry that was previously only available to forum members. A snippet:
As more and more of Dungeons & Dragons Online becomes (ready-to-play,) we're spending more of our play time running through dungeons the way the game is meant to be played. This means no cheating by using admin commands like (immortal) and (spell god.)
When we stopped using the latter of those two cheats unlimited spellcasting we discovered a big problem: spellcasters were running out of spells very early into each dungeon. We always knew this was going to be somewhat of an issue, particularly for lower-level spellcasters, but we had underestimated how much of a problem it would be. All of a sudden, wizards, sorcerers, and clerics didn't have even close to the number of spells they needed to be effective.