Don't forget that when looking for very contemporary artworks, it is often helpful to search for artist websites and galleries. You can use resumes and bibliographies from articles and books to find out which galleries have exhibited a particular artist.
Many Art & Design magazines are making more images and articles available online. Magazine websites often post information job openings, exhibtions, and happenings that might not appear in their print editions. Here's a list of some of the most useful ones:
All of the collections listed below belong to the University of Michigan and can be accessed digitally.