On Tuesday, May 23rd, we'll be installing new server hardware for the catalog system; the library catalog will be down for at least a few hours and perhaps all day. Please call the library if you need help finding something. We ourselves won't have catalog access either, but might be able to figure out how to find what you need. :-)
You won't see any immediate difference in either the catalog or the services available to you; but over the next few weeks a lot of changes will begin to appear, both to what you can do and to our behind-the-scenes work.