Information on OLAP Databases?

oh-lap asks: "One relatively new topic in computing that hasn't seen much mainstream press (yet) is OLAP or multidimensional databases. OLAP is based on the principle of organizing your data along a number of dimensions which can be pivoted and drilled into. OLAP sounds like a neat idea and represent an abstraction of several problems which I've seen tackled by custom coding jobs. The biggest problem with OLAP right now, seems to be a dire lack of expert knowledge in the area and no standardized API or query language for OLAP servers. But the lack of decent introductory reading material is particularly bothersome. If there are any experts (or even dabblers) in OLAP out there, what are the sources of information (books, websites, forums, webblogs, etc) that you go to for info about OLAP? The issues I'm interested in are wide ins scope and include everything from querying and data modeling to actual design of an OLAP server. Any pointers"