Is there a list of Salesforce images that can be used in custom pages and formula fields?

I would put salesforce images that are used to render stuff in the same broad bucket as screen scraping. Although this may work okay, there isn't a way to guarantee against breakage some day. (I've used the sfcti js resource for CTI and the locations have changed twice in the last 12 months, there isn't a way to tell when they changed except for when users discovered CTI won't work anymore, therefore this approach surely has its perils) Having said all this, a quick google search threw up this page which seems to catalogue quite a few images / icons.