I don’t remember if we ever talked about PLA's Tech Notes – a wonderful source for technology information for librarians.
The latest technology presented by Richard W. Boss in Tech Notes is about "Library Portals" (single search access point to multiple library databases ), their history, technology behind them and what costs libraries need to pay to have one.
A portal can be mounted either on a dedicated server or on a Web server that supports other applications. The software is generally described as a portal server product. Major vendors include BroadVision, Epicentric, iPlanet, Oracle, Plumtree, and Tibco. Plumtree is the market leader. There are also some smaller vendors which focus on the library market, among them Fretwell-Downing, MuseGlobal and WebFeat.
If you have an hour or so available, click on Tech Notes for more details and additional information on other technologies used in libraries.