I likes it.
I think the first section is a must-read for everyone here who might be fiddling with lead-acid batteries in their long-term setup. It explains an (the?) ideal charging process.
If the specialized components used are not too out-of-date (document written in 1999), I'd like to built this circuit to use. I might also layout a PCB for it if it works as well as I think it might (I have a little more time for this kind of stuff since the start-of-semester crunch is out of the way here at OSU).