I'm having a hard time figuring out and staying committed to what-all needs to be reviewed and when, and that's starting to make my next actions list sag and bloat up. I'm trying to come up with a reasonable schedule I can stick with for a while.

I'd like to see what some folks' current schedule of weekly and monthly(and beyond) list/context/project/etc. reviews looks like, including reviews that may only tangentially be related to core GTD practice. What are all of the personal check-ins you do?