Did you happen to try "free" to see if linux thought the swapfile was still active, despite the swapoff commands?
No, I didn't think about that one... Will try this if the problem occurs again, though.
I had the "Qtopia crash after starting the network for the first time" again today. There's definitely something up with that, but reproducing it seems problematic at the moment.
I didn't have any crash after installing WellenReiter and Kismet, but launching WellenReiter caused some trouble: I got a dialog box warning me that I was running it without root privileges, so there might be restrictions in capabilities. I continued, and after that I couldn't exit the program, there was alwas the WellenReiter icon in the bottom taskbar, even when a "ps -ax" command didn't show wellenreiter running... and every now and then, WellenReiter would pop up in the front, and present me with the same dialog about root privileges... Annoying. I rebooted and got rid of this. I've activated the "execute with root privileges" for this application, I'll see tomorrow if this changes anything (right now I don't have a WiFi network close at hand to test it)...
You sure get around, don't you?
Traveling a lot has its good sides, sometimes!