Click here for Fabrycky, Ford, Steffen, et al. 2012, ApJ accepted, a paper using simple physical models of transit timing variations to confirm 4 planetary systems.
If you'd like to have a go at them yourself, here's the timing data (sorry, the first arxiv posting had these wrong).
Here are plots of the simple models for other confirmed systems:
Kepler-23Kepler-24Kepler-25Kepler-26Kepler-27Kepler-28
To pick up these companion papers, check out my collaborator's site (see "Associated Scientific Papers.").
The official Kepler news feature is here, and below is a visualization of all the multi-transiting systems known: