Well, another update has come out (10.6.6.) and I cant even upgrade to use the app store. I have tried for the 5th time with the same results and have reverted back to 10.6.4. Does anyone have any idea how to solve the problem of intermittent drop outs on the wireless for anything above 10.6.4? 10.6.4 works perfect, so I know its not my router, its a software issue.