Making your data open can be as simple as dumping the data somewhere on the internet. A baby step beyond that is build a simple REST API on top of your data. This approach is becoming more popular within visual arts and design institutions, mainly large ones, with a few really solid Collection APIs out there now. Properly linking this data is the next step, but one almost no institutions take.
I’ll be offering a sneak peak at the soon to be released SFMOMA Collection API during the LODLAM Summit and asking the question “now what?”