A good friend of mine here is absolutely cricket nuts and was complaining just the other day about lack of sleep due to staying up to either watch on TV / online, or listen on the radio to coverage of the Ashes but is not currently available for me to ask on your behalf as to which.
In the meantime, have a look at these links I just googled. I also like cricket but have been content with catching the news highlights and so cannot vouch for the quality etc of these links for live coverage so apologies in advance if there are problems .
Or go to www.myp2p.eu and pick up an online feed. You can often get half decent Sky or Channel 9 coverage. I often plum for Ch 9 myself, it's great listening to Benaud, Chappel, Healy etc squirming around, trying to make excuses for the Aussies