How to import data into WordPress using a CSV or tab-delimted text file

We have a list of business names and addresses that we wish to show up on one of our WordPress pages. We can export the data into a tab-delimited text file from the database.

I want to be able to show the data on the page with an alphabetized format on the top of the page and have people click on the letter to be able to view addresses from that letter. Example:

A B C D E F G H, etc…

Can anyone point me in the right direction? Or can someone on the list do this for us? It would be great if this was AJAX-based so the page would not have to load all the time.

I don’t know how complicated this is to do in WordPress. Keep in mind the data would change every so often with updates, so we would like an easy way to import the data on a regular basis.

Thanks,
Chris