Idle Power Usage
I found out my idle usage was 250w; this seemed really high, so I started on a fact finding mission (i'd already tested a lot of stuff with my Kill-A-Watt, but apparently nowhere near enough). Heavy hitters being Internet stuff (smart home hubs, modem, router, wifi, etc), and PC (running Plex, FTP, WWW, etc). Since starting this project, I've gotten down to about 175w easily; pretty substantial savings were gained from doing virtually nothing (replacing wall-warts with better ones, removing useless crap from the home (Z-wave repeaters, unused wall-warts), messing with the computer power profile, etc). A huge accidental fix was buying a "kitchen PC" that draws like 3w idle, and amazingly has virtualization, so my home PC doesn't "need" to run all the time anymore (70w saved, this PC is my work PC, and serves up FTP/WWW saving me more in hosting that it costs in electricity).
Idle is now tantalizingly close to 100w (about 112w generally), which will have saved me about $150/year. In 2 years, will break even for what I've put in, and I've lost no creature comforts (other than having to press "power" on the main PC when we want to watch Plex). My GF thinks I'm insane, but she loves the SmartHome toys, so she abides.