That article/video is a total FAIL.
"Music controller apps that run on the iPad require that you set up a wireless router or a Bluetooth link."
Bzzzt... wrong on both counts.
Most iPad music apps connect via wifi/bonjour not bluetooth and they don't require a wireless router. You can just create an ad-hoc network between your laptop and the iPad. That's what the Create Network option under the airport menu on your Macbook is for.
"Mu is a free controller plug-in that allows the Lemur to fully control Ableton Live 8. If you own Live 8 and its separately available plug-in called Max for Live, you can get into Mu."
I like how you never mention that the Lemur costs 4 times as much as an iPad nor how the M4L plugin that the "free" Mu plugin requires costs another $300.
"Have you ever been using WiFi to surf the web and your connection disappears for a minute?"
No. And I've never had a "drop in wifi connection" while using TouchOSC. I like how you mention the word Ethernet almost as many times as the word Lemur.
By the way, resistive multitouch as you find in Lemur is a poor choice for live performance purposes due to a design flaw since unintended "touches" can occur. Which is why there are so many reports of angry Lemur owners burned in live situations by the lack of response and by the film initiating unintended events. Oh, and try picking up a Lemur and moving around in the booth. Wired ethernet, wired power cord, resistive touchscreen = legacy technology.
Try harder next time.