A great piece on NPR recently on How To Save A Public Library: Make It A Seed Bank where a partnership between the Basalt Public Library (CO) and the Central Rocky Mountain Permaculture Institute have created this wonderful seed bank.
There are a few other seed bank libraries as well: A past blog post from July 2010 on Richmond (CA) seed lending library. Rebecca has a blog - www.richmondgrows.org - on creating your own seed lending library and San Fran now has two branches lending seeds!
Other libraries like Fairfield Woods Branch have a seed to seed series; Alameda Free Library also offers similar service; and East Palo Alto Seed Library has started a seed lending library partnership with Collective Roots.
If you know of more libraries with seed lending services or banks, please comment or email me!
3/5/13 Thanks alaskadragonfly for this awesome list of Seed Lending Libraries!!
I found your post while I was working on a Library Marketing project about libraries involved in seed lending projects. My tumblr post includes 32 libraries and 2 museums: http://librariesbuildcommunity.tumblr.com/post/44533806843/lending-seeds-at-the-library