Yahoo! have just launched a beta of their audio search tool and it’s lookinglike it caould be really useful . It searches all the major download sites as well as the web. I’ve only had a couple of plays with it and found some Radio 4 comedy I’ve not heard before.
My only concern is around copywrite – the limited searches I did found copyright material on personal homepages let’s hope that the legal firms of the big record companies don’t find out about it, they’d have a field day.