It's possible to use an RDS encoder to show various information from the song played. RDS encoders are not cheap (cheapest is around 100 €). around, you'll find a lot of diy projects and some mounted. Choose the one that best suits your needs considering that RDS is RDS: they can have a lot of features but youll' need only the 10%, the same that every encoder has.
You'll need also a plugin for winamp to load the rds encoder data, but there's a lot of resources on rds encoding out there.