Using the Archivegrid resource, I typed in Sitting Bull autograph card and learned the following about Sitting Bull:
He was a leader of the Hunpapa Sioux
He led the Sioux and Cheyenne warriors against the U.S. cavalry at the battle of the Little Bighorn.
Sitting Bull toured with Buffalo Bill Cody's Wild West Show.
He was killed for resisting arrest for his unwillingness to abandon the traditions of the ritual Ghost Dance.
My next search was "Mormon pioneers in the Midwest" .
There were 10 results.  No surprise, most of them were located at Brigham Young University.
It was interesting to read through what these  collections had within them.  Very detailed descriptions of what is in the collections and also if the collections were split up at some point where they were sent.

Moving on to the CAMIO resource, I find this really interesting.
I did the search for "Sioux" as recommended.  It brought up 63 works of art.  Everything from bead work, to carvings, to photographs.  Really cool stuff to be able to look at and see without having to go to the actual location.  I could spend hours looking at this stuff.
I next searched for "Monet".   Pretty good clarity in the screen views.  Love the descriptions and history provided on each piece.
I can see this resource just being a great opportunity for the students to be able to view pieces of art that they may never get to see. Not just being able to view it, but learn about what inspired it or what techniques were used to create it.  The art teacher could bring a whole class to the computer lab and have Monet at his fingertips, or just use the smart board to show the class as a whole the various works of Monet.  The slide show option would make this type of presentation especially easy and fun.
The ability to put them into a web page would make it easy for students to then view from home for further study if preparing for tests over different styles or artists.
Really cool resource!