After the recent software updates (I can't remember if it was 10.3.5 or the Airport update) my wireless connection is very unstable at home. Once the connection is lost, I need to power cycle my Linksys router (latest firmware installed) in order to reestablish it. I've been using the router for a long time and always worked flawlessly. The other 2 networks I use (both with D-Link routers) don't have the same problem. It also seems that when the connection is broken, my other PC laptop also loses connection, which never happens if the iBook is not there.
Any idea?