I've noticed two problems with WiFi on the 2006 OS:

1.) The connection problems I had at work are back. With the initial 2005 OS I couldn't connect to my office WLAN except with a link-local IP address. This was fixed with the most recent 2005 OS (the one that actually came out in 2006). Now it's back again in both the 2006 Beta and Final releases. What this means is that I can't use it from work and I can't reliably expect it to work anywhere where there is "noisy" WLAN traffic.

2.) Occasionally my WLAN just stops working. It still reports as connected, but nothing happens when I try to pull something up in the browser. It's possible this could be a problem with my Linksys router and DD-WRT firmware, dropping the connection. I have a problem like this with my Windows laptop. But on the 770, a reboot often seems to solve the problem, and losing the connection occasionally seems to be related to hard crashes (automatic reboot).