The Swain Chemistry and Chemical Engineering Library has a great list of resources you can use when researching a potential employer before going on an interview. Some of them are specific to chemists – about the only thing not listed is checking for patents issued to the company.
Checking out the company is something I highly recommend. Not only does it set you apart from other candidates (most of whom don’t bother to do this), but it shows you’re serious about that company, and you’re not going to waste their time asking questions you could easily the answers to on your own.
Thanks to Jennifer P. for pointing this out!