The DVDList is an invaluable resource, but if I'm not mistaken I believe it lists past DVD release information as "out", "discontinued" or something like that. It only lists future releases with a date.
I don't know if this is what you are looking for, but this is the only answer I have. If you use DVD Profiler to catalog your DVD's you can easily find the release date for most DVD's. If you click on Add DVD To Collection and then click on the Add By Title tab, a window will pop up with a...