I've loaded the beta and have a wireless LAN...No problems short of what I reported in the beta thread (Recast Online do not have clean start/stops)

My recordings from Recast Online do not have clean start/stops (i.e. a recording has about 10-15 seconds of the previous song at the beginning and is cut off prematurely at the end.

You need to make sure the correct recording device is selected in Recording Control. Go to start->run and type sndvol32 -R. On my soundcard, I had to select Stereo Mix. If you need to record audio from applications that play on your computer, you will want to select an option such as Mixed...