Tools for identifying what a DLL provides?

[David D. Hagood]

I have a DLL from a manufacturer that I don't have the source for, nor do I have 
the header or the import library for.

Since Wine developers frequently have to reverse engineer what a given DLL 
provides, does anybody have a good recommendation for a tool that can scan the 
DLL and report what functions it exports, and their arg types and return types?