The nice thing about tag libraries is that they don't necessarily need a TLD file to drive them - a folder is more than enough for simple cases:
Hello, world! from a tag
It's really that simple!
<@ taglib prefix="tags" tagdir="/WEB-INF/tags" %> <tags:hello />
There's obviously more to it (how to pass the tag body, how to pass parameters to the tag) - maybe next time :)