welcome to the board... everyone has offered good suggestions...
just to pile on... if you don't have sirius you can listen to Steve (Kasept) online for free at
http://www.attheracesandbeyond.com
and if you sign up for some online wagering sites like xpressbet and youwager they will often let you watch races online for free even if you are not wagering...some of the racetracks as well have their own feed on their websites.