For DRI members, you should be aware that the DRI website has implemented a new interface for searching the DRI Expert Witness Database. Essentially, it is now possible once again to search the database yourself, rather than fill out a web form and ask the DRI staff to search it for you. However, if you want to view a transcript or CV of an expert, you have to pay $25-50, depending on how you want it delivered.
A couple of years ago, DRI's expert witness database was being offered through a slick interface constructed by an outfit named Juris or something, and you could actually read a transcript before deciding whether to buy a full copy. Unfortunately, Juris did not survive the dot.com bust. Now DRI appears to be in the process of building out a usable interface again, which is a good thing.
DRI states it has 60,000 experts in its database -- but I think the large plaintiff-oriented expert witness databases dwarf that figure. TrialSmith says it has 137,000 experts on file, for example. DRI members have to be more diligent in submitting transcripts to DRI. DRI could help by posting clear instructions on how to submit transcripts.
This overview of researching experts on the Internet has other sources, among others another defense-oriented database called Idex. Idex says it has 800,000 "records of expert involvement". It was founded in 1984 by a former St. Paul Ins. Co. Claims Supervisor and is based out of Kansas.