Some fixable design flaws in the WiFi standard, coupled with a bunch of implementation issues, means that virtually all WiFi devices are at risk.

After reading up on the various tech coverage of the last couple of weeks, things have settled down somewhat. We've gone through the usual phases of "ZOMG everything is broken!", through "It's bad, but not as bad as we thought" and now we've landed on "OK, we can work with this".