If you aren't already using them, I recommend some of the Firefox extensions that can be found in the Firecat project : http://www.security-database.com/toolswatch/FireCAT-1-4-package-released.html

Of the newly added extensions, I especially like RESTTest, https://addons.mozilla.org/en-US/firefox/addon/5946 or from http://www.xucia.com if you don't want to register.

I had been working on an extension that would basically do what HTTPRecon ( http://www.computec.ch/projekte/httprecon/ )does, but from within Firefox, and RESTTest is nearly as good and seems to be an excellent tool to perform initial pen testing on a web server.

yeah, the intermittent interference would be enough to make you go crazy.

http://www.securityfocus.com/news/11537

It appears only ARP packets are vulnerable, but that alone may be bad enough for a quick, targeted attack. The article also mentions the attack has been added to the developmental version of aircrack-ng.

http://blog.didierstevens.com/2008/11/23/quickpost-wifi-availability/

"A WiFi camera, operating on channel 1, is streaming video. When I switch on an analogue, wireless babycam, you see a strong signal appearing near channel 9 (watch the SPECTRAL VIEW of the Wi-Spy spectrum analyzer, e.g. the window in the upper-left corner). After some time, I switch the babycam to a channel near channel 1 of the WiFi camera. Now the transmission of the babycam jams the transmission of the WiFi camera, and we lose connectivity.

Powering off the babycam restores the WiFi connection."

The blog entry includes a link to a video demonstrating the attack, illustrating the danger and ease of a layer 1 attacks.