In Yags, characters gain experience points during the game which they can then use to spend on skills. This gives reasonably fast progression in short periods of time, and doesn't really take into account training or study. For Traveller, I'd prefer something somewhat less gamey, and closer to how Classic Traveller implemented things.
Glendale Website - My main web site.
Yags - Main site for yet another game system, a generic GPL'd tabletop RPG.
Yagsbook - Documentation on the Yagsbook RPG documentation format, a Sourceforge project.
Mapcraft - Documentation on world mapping tools, another Sourceforge project.
Midnight Saga - An Ars Magica campaign.
The current topics are currently under active development (relatively speaking).
Yags is Another Game System - Game design notes for Yags, a Free roleplaying game system I use as the core system for most of my campaigns.
Yagsbook - Notes on an XML based documentation system I use for documenting Yags and related campaigns.
Full Thrust - Notes on Full Thrust
Stargrunt - Notes on Stargrunt.