Douglas West has a list of open problems in graph theory and combinatorics and a glossary of terms in combinatorics which may be of interest. The open problems are keyed to the four volumes of his The Art of Combinatorics, which is a series of four advanced graduate textbooks/reference books, on "Extremal Graph Theory", "Structure of Graphs", "Order and Optimization", and "Arrangements and Methods"; each is intended to be (I think) a semester or so worth of material. The series is in preparation; the title is, of course, a nod to Knuth. I can't vouch for the books being any good, because I haven't seen them.
There seem to be a lot of lists of open problems scattered about the Internet. Has anyone compiled a list of lists of open problems?
(I found the glossary while Googling for information about hook length of partitions; it didn't help for that, because I already know what hook length is.)