System Check - What might be learned from different systems.

Quick N Dirty Adventures - How to put together complex adventures in record time!

Twisted Adventures - How to make adventures more challenging and unusual!

Player Handling - How to ensure the players are on your side...

Character Uses - How to add depth to the parts played by characters (both NPC and PC).

World Uses - How to construct, reconstruct and deconstruct worlds to draw them out in adventures.

Tool Uses - How to make equipment and items play bigger roles in adventures and game worlds.

Faction Uses - How to use and abuse organized factions in game worlds to further adventures.

Genre Uses - How to make the genre(s) work for you.

Rule Uses - How to further the game by simple rule extensions (not necesarily alterations; usable for most systems).

Other Uses - Ways to use roleplaying in new and interesting (and possible practical or even profitable) ways. Useful for non-roleplayers, as well!

Classroom Reports - Results and inspiration from challenges and exercises handed out through maillists and the forum (http://community.gurpswiki.net/forums/10/ShowForum.aspx)

Online research resources include:

http://www.indie-rpgs.com - The Forge, very indepth (and somewhat academic) discussion network for roleplaying games

http://www.burningvoid.com/rpg/gm.php - Gamemaster advice and tools

http://forum.rpg.net/ - RPG Net's forum, a bucket full of comments and ideas on the topic of roleplaying games

http://www.roleplayingtips.com/index.php - Roleplaying Tips, another bunch of advice on a lot of Gamemastering topics

http://forums.sjgames.com/index.php? - The forum at Steve Jackson Games, mainly for Gurps and Munchkin