I'll try to post useful links to this site whenever I feel readers can benefit. All of us, for example, should be checking out this one. Publiclibraries.com is a clean site that provides links to every online card catalog in the US. Check hours, get directions, and reserve and renew books under straightforward membership conditions.
If you've got an organization or link you'd like publicized, submit it as a comment or e-mail it to me at firstname.lastname@example.org.