Before you go off and make a new learning object, it's generally a good idea to go off and see if the thing you are considering making has already been made. How do you go about doing this?
Google is always a good first stop. But there are other places to look.
Eventually, we hope to have a definitive and searchable index of all learning object repositories. For now, I've put together a provisional list of places you can go, culled from lots of other listings.
Listings of Learning Object Repositories
University of Wisconsin
http://www.educause.edu/nlii/keythemes/LearningObjects.asp (middle of page)
New Media Center
Key Learning Object Repositories (culled from these various lists)
Interesting RSS feed approach