I love the tools developed by the SIMILE folks at MIT, open-source tools that make interoperability between data collections a key focus. They have lots of neat tools that are more meta, but two in particular could be very useful to off-the-shelf digital historians.
The other tool is Exhibit:
This is terrific. Not only can you show your data as a timeline, you can organize and display it in any number of other ways, all helpfully discussed for you on the exhibit wiki and tutorials. And you don’t have to know anything about databases! This is a big hurdle for public historians with little resources in the way of money and time for web stuff, who probably know a bit of HTML but have no interest at all in learning mySQL or ASP or anything else.
I’m thinking that Exhibit would be a great and easy way for local historical societies to make their basic regional history data interactive. If they have nothing else in the way of data, local history museums and societies usually have a page on “History of ____ County,” usually a long, unformatted block of text (sometimes with paragraphs). With a little bit of data mining but no new research or writing, this could be turned into a neat web exhibit that will keep people on your page longer and inspire folks to learn more about local history! Good work, folks. I’d love to talk to local historical organizations that have been using these tools already.