Welcome, bugglie!
Unfortunately there are not a lot of books out there for the Bulbophyllum hobbyist. I like the Siegerist book, though if you want pretty photos make sure you get the hardcover, the paperback is a much lower-quality reprint.
For general culture and some details on the genus (it's too vast to cover in great detail in one volume) Bill Thoms'
Bulbophyllums; the Incomplete Guide, From A to WHY? is a good read. The CD w/ PDF is only $20 if you don't want to spring for the hardcover.
If you want info on particular species, check out the culture sheet archive at
Orchid Culture -- Charles and Margaret Baker, these are incredibly useful references and a real bargain at less than $1 each. Hope this helps!
--Nat