Could be a complete red herring but I was having all sorts of fun on my cacky sky router before and after 1.1. It was however considerably worse after 1.1 with dropped connections, refusal to connect to sip services etc.
Bizarrely, I disabled IPv6 on a couple of laptops I had connected and since then (9 hours and counting) the n900 has been rock solid on wlan. Never had more than a couple of hours previously without having to reconnect....