Endocrinology - NCBI Bookshelf (Wiki)
The Endocrine System (Goog)
This is a helpful resource. It offers a brief discussion of hormones in general.
See: Intracellular Receptors and G-Protein Coupled Receptors for excerpts.
It also has a link which provides a brief description of 50 different hormones. http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/H/HormoneTable.html
Like the Kimball link, above, Wikipedia offers a brief discussion of hormones in general. It also does Kimball one better by having a link to 66 different hormones.
Endocrine System (WK)
This one seemed interesting. I'll come back to this.
Karolinska: Endocrine (OD)
Endocrinology (OD) - come back to this
I'm currently working on a Dictionary of neuroanatomical terms for the Subcortical Brain . My focus at the moment is neural architecture, but I occasionally run into a reference that says interesting things about hormones. I've listed the links below with the expectation that I'll be coming back to them later.