bakedjake - 2:46 pm on Dec 6, 2004 (gmt 0)

Data from information providers is often incomplete. For example, it's widely known that most of the info providers have a problem removing data of businesses that are closed, because you don't need to file a form to stop doing business.

The number one issue affecting local search at the moment is data quality issues, IMHO.

Also, many of the engines you've listed Chicago use multiple data sources. A local search engine would not have a good result set using one and only one data source.