Checkpoint (http://www2.checkpoint.riag.com/ ) offers timely access to an assortment of tax materials at the local, state, federal, and international levels, as well as analysis of the tax code. Although tax researchers will find the information provided similar to what was included in the popular loose-leaf publication from the Research Institute of America, the Folio search engine makes it easier to find information on different issues. In addition, Checkpoint features archival material from the Internal Revenue Service dating from as far back as 1954.