NWN Campaigns - Dungeons and Dragons Online Roleplaying Using Neverwinter Nights 1 & 2

The DM-Friendly Initiative (DMFI) has published two self-teach tutorial modules on NWVault designed to teach basic DMing skills. They can also be helpful for more experienced DMs as a comprehensive review of the DM client (along with maybe presenting a new trick or two).

DMFI 101: So You Want To Be A DM (for NWN / NWN:EE)

DM 101 for NWN2

Links have now been updated for the new Neverwinter Vault.