[Editor’s Note added July 20, 2011: The Images database no longer exists as a separate database. Images in PubMed Central® articles may now be searched via PubMed Central. For more details, please see "A Brand New Look for PubMed Central".]
You can now find images in PMC articles through a simple PMC search. Here is NCBI’s example:
There are, however, a couple of important exceptions: images will not appear for searches that use the Limits or Advanced Search features for searching. If you want to see a live presentation of the new format, click here to perform a search for West Nile Virus in PubMed Central. Some very attractive images appear in the side bar, displayed like this and opening up on mouse-over into an enlarged view with descriptive captioning (this is a static image below, but you can link to the page with mouse-over capabilities by clicking on the image):
With the demise of the database, gone is the contentious presentation of “highly cited” images on the opening page of the former database. “Highly cited” designations are created by all kinds of commercial publishing variations, and I guess it made sense to NCBI that they should not be in that business. The important thing is that the images found in the PubMed Central taxpayer-funded repository can be discovered, and certainly the discovery of relevant images will lead to the discovery of additional articles.