I've been impressed with the way the Glicko rating system works. In particular:
- more games played recently cause your rating to stabilize
- fewer games played recently cause your rating to fluctuate until you get several recent games under your belt
USCF modified their system to be similar a few years back (where there is a sliding scale to amplify or dampen the rating change for a given match), and now that Glickman (the inventor of Glicko) is on the rating board for the USCF, I imagine they'll eventually adopt an even more flexible system, like his own.
Is there a reason (other than being resistant to change, or that they just haven't gotten around to it yet) that FIDE doesn't adopt a more accurate rating system?