Here are some people and organizations that you may want to follow on your own Twitter account, not the library's.  This is entirely subjective. They are intentionally not in alphabetical order. It makes you more likely to scan the whole list. I am not adding any new ones to the list.

Organizations:

Organization	Twitter Bio	Website	Twitter
Association for Rural and Small Libraries	Assoc for Rural and Small Libraries	http://www.arsl.info/	arslibraries
New York Library Association	Founded in 1890 to promote New York libraries.	http://www.nyla.org/	NYLA_1890
ALA-Public Library Association	Public Library Association, a division of the American Library Association.	http://www.ala.org/ala/mgrps/divs/pla/index.cfm	ala_pla
WebJunction	Connect, create, learn and share at WJ. An online community for library staff.	http://www.webjunction.org	webjunction
TechSoup	The technology Place for Nonprofits	http://home.techsoup.org	TechSoup
TechSoup for Libraries (was MaintainIT)	Sharing tips and techniques on maintaining public computers from libraries across the country so you can learn from the experiences of others.	http://www.techsoupforlibraries.org/	MaintainIT
@ Your Library	Sharing tips and techniques on maintaining public computers from libraries across the country so you can learn from the experiences of others.	http://www.atyourlibrary.org	AtYourLibrary

People:

Name	Twitter Bio	Website	Twitter
Valerie Herman	Reference librarian, enjoys Web 2.0 technologies and reading.	http://www.somerslibrary.org/	Valerie_Herman
Michael Sauers	Technology Innovation Librarian, Nebraska Library Commission	http://travelinlibrarian.info/	msauers
Carol Batt	Public Library Assistant Deputy Director Technology, librarian-at-heart, reality TV fan	http://www.buffalolib.org/	carolbatt
Jill Hurst-Wahl	Librarian, information professionals, consultant, speaker, author who connects you & your content with the world. Faculty at Syracuse University (iSchool).	http://www.hurstassociates.com/	Jill_HW
Beth Tribe	Coordinator Software Support and Training for Howard County Library, social web aficionado, budding photographer	http://notatech.wordpress.com/	mlibrarianus
David Lee King	I write about, talk about, and work around libraries, social media, and digital communities. Also check out my videoblog: http://davidleeking.com/etc	http://www.davidleeking.com/	davidleeking
Jessamyn West	rural librarian geek	http://www.librarian.net/	jessamyn
Elizabeth Olesh	Librarian's librarian, photographer, writer, superheroine.	http://www.thedisorganizedlibrarian.blogspot.com/	Lizo18
Polly-Alida Farrington	Library consultant - technology, websites, project management	http://blog.pafa.net/  http://lib20.pbworks.com/	pollyalida
Roger Green	Vice-President of the Friends of Albany Public Library, Librarian, a child 50+ years his junior, music, politics, baseball, JEOPARDY!, God, the celebrations of life.	http://aplfriends.blogspot.com/ http://www.rogerowengreen.blogspot.com/	ersie