For now (and this may change by as soon as next week), I'm on from 4:00-6:00 p.m. Eastern. You can listen live on the radio at 90.3 FM if you live in central New Jersey, or listen to the web stream at
http://thecore.fm. There are links at the top of the page for different streams. Most people will want to click the center one (64 kbps). The left link is for dial-up modems, and the right one is AAC+, a high quality format that only plays in some players (including the latest versions of Winamp).
The link Moe posted works for now. Actually, thecore.fm will redirect to thecore.rutgers.edu until we shift everything over to the new server.