Hi Matthew,
For the newer killifish addict, there are several good, inexpensive books.
The nomenclature is pretty outdated in most, but I still like Steffen Kellner's little Barron's paperback, Killifish, and Ed Warner's Success with Killifish. The first is out of print, but still available in some pet shops and web sites, and the second is always available from Ed's widow, Ruth Warner <[email protected]>. Except for recent fish-name changes, both are just excellent and very inexpensive.
BTW, starting about Vol 2 (Maybe 3?) the Baensch Atlas series killifish have been edited by Steffen, and he has done great things there.
My personal favorite for W. Africans is Radda and Purzl, Color Atlas of Cyprinodonts of the Rain Forest of Tropical Africa. A book with a title that long has to be interesting.
It is enormously expensive, if you can even find it. Poor binding means it falls apart, quickly, too. 
Last, and certainly not least is another out-of-print and somewhat outdated book, Tony Terceira's Killifish. Get it if you can find it, as it is now a collector's item and pretty darned good, at that.
That should be enough to keep you in trouble for a while. 
Wright
PS. The excellent Beginner's Guide is being completely revised at the AKA and will be really a prize -- worth much more that a year's dues. It comes with a new membership, so wait until the new version is announced to join. [WOW! Did I just put a world of pressure on the Beginner's Committee to get that damned thing done?
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