I've had the 13" Air since the 21st now, I am still noticing quite frequent drops in WiFi connectivity - more so than with any other computer in the house, including the iMac which also has Lion installed. I've set it to a static IP address, this hasn't resolved the problem. I've also changed my DNS host, this also hasn't really resolved the problem. My modem is evidently not the issue either, as, as I have mentioned, the iMac is working fine. I considered posting this earlier, but I wanted to be sure it was a genuine problem and not just me being a dimwit.