Check out the SHOUTcast Technical Support Sticky post titled...
SHOUTcast: Important Info & Answers to FAQs. READ ME!
Scroll down a bit and look for the section titled...
General SHOUTcast Information -> SHOUTcast ToolBox (All sorts of nifty add-ons for SHOUTcast)
1. The PHP based XML parser is a complete solution and comes ready for you to customize.
Note: Apparently this link isn't working anymore.
Try this thread
for other ASP options.
Also, for an html implementation, check out:
Oddsock's Do Something DSP plugin