Well, I think Mini-Stumbler is pretty cool. I have an Ipaq with a 1-PCMCIA card battery pack and an Orinoco card. Of course I'm running Mini-Stumbler.

Something else that I just got is CESniffer 3.1 from www.epiphian.com. It's an evaluation version and you get these annoying adveritsements for the $249 version pretty often. It also will only go into promiscuous mode for a few seconds. That's enough time to prove that it works but really not be able to do much with it. It seems like the promiscuous mode timeout varries - I've seen 17 to 50 seconds.

I'm gonna have a hard time justifying $249 for a sniffer for my Ipqa. I have a BSD laptop that can sniff and do raw promiscuous mode and has a LOT more storage capacity. I do think I'll play with this in a pinch though. It'd definitely be nice addition.