I very recently created a Twitter account for NNT, in large part because I thought Jessica's Twitter feed on the RAN page looked pretty cool: http://www.saclibrary.org/?pageId=912.
I wasn't sure how easy it was going to be to get the widget on the NNT branch page, but it turned out that Twitter has an easy process that creates the code you need for you. Just go here and then select whether you want to put it on your blog, Mspace page, or website. It gives you a choice between Flash and HTML and I found that the Flash widget looked better. (I also used the same process to add the Twitter feed to the sidebar here)
Anyway, here is the end result: http://www.saclibrary.org/?pageId=607