Additional Fields when adding a new tag

Hi,

I was wondering if there was a plugin or hack available for this. Since I’m using wordpress more as a cms then blog, tags play an integral part. So as an example, the webpage is a list of current band tours. I use categories as the tour name and the tag is the band name. Now, i want to have a link to the band’s website and other things. I prefer to enter this link when I enter the band as a ‘post tag’ or have some way to have a database with all the additional information as there are a few things I want to add for each tag. Is there some way to add additional fields other than just a description to a ‘post tag’?