Phil, everytime you make one of these "What If?" posts it hits on something I'm working on. Could you cut it out?
Pre-announce: Dungeon Crawl: An OGL-based game which I'm told is like Blue Rose's Tru20.
Tag: Kick in the door. Kill the monsters. Take their Loot. Find the next door.
All class, race, magic, major equipment, etc abilities are expressed as feats in the game. Want to create a 6th level character? Pick a race, assign abilities (str, dex, etc) and tack on 6 feats. Done. Want to scale a monster for the current party level? add or remove feats as needed. Skills are based on class and ability (and the occasional feat). The objective is to make it easy to create a character of any level and easy to level up. Dungeon Crawl characters are not exactly as powerful as d20 characters (haven't worked out a conversion just yet since DC feats are more powerful than standard d20 feats). Combat is also very different supporting both abstract and miniature based modes. Contains level-based and verb/noun based magic systems out of the pdf.
Even with the Munchkinesque tag line above, non-combat, non-dungeon based adventuring will be possible with Dungeon Crawl. (And I wish I had known about TOGC's Dungeon Bash game as I was working on this....)
When will it be done? When is my stuff ever done?
Seriously, I have it half written and half on some notepads right now. Should be playtested over the summer. I expect it to be about 100 pages over three "books" when finished. The three books being titled Dungeon Crawl, City Stroll and Wilderness Run. The second two books obviously take the dungeon out of the game.