Chromecast: mine is about two feet away from my Airport Extreme, but those feet are vertical and I'm sure the antennae of the Airport are pointing horizontally. Net effect is a lot of flakiness. A non-trivial part of my home theater upgrade plan is to have everything connected to wired Ethernet. The only way to get Chromecast functionality with a wired Ethernet jack is currently a television from Sony. The "Nexus Player" is WiFi only. (Grrr.)

WiFi Roaming Fix: now disabled. It totally thrashes on campus, where there may be 6-9 Cisco APs within radio range, and Cisco is (presumably) doing its own fancy management of my broken Android phone. Internal management + Cisco management = serious problems.

802.11r / 802.11k: Ahhh.... So the real solution to my problem is "just wait until the standards get implemented, debugged, and revved".