The Mini only saw one other network, at channel 6, while I was at channel 11. But it didn't always see that network, so I wonder if the other person turns their AP on (why isn't it on all the time?), it tries channel 11, sees I'm using it, then goes to channel 6, but when it tries channel 11 it screws me up. If that's the case, maybe I can set mine to channel 1 and hope that it doesn't try there before either of those (11 does seem to be the default).

I'll also try the G-only thing, too. I'm not actively using my B clients.