Thanks dgemily. Unfortunately I found many of these pls links, as well as those defined in the XML database, to be dead.
I used the working ones as a starting point, then downloaded more by hand from Shoutcast site. Then I ran the VBscript to generate the database.
I like the idea of the automated download, but it didn't work well for me (would get banned after 2 downloadsed stations, etc...). I also like the idea of the plugin (allowing for station refreshing), but unless .pls files are stored locally, Winamp can get hung up.