Marty Heyman has written a good high-level piece updating us on OpenLDAP, in which he briefly recalls the history of OpenLDAP and introduces some of the good features, such as the back ends and overlays. Interesting numbers regarding HP’s use of OpenLDAP too: “fifty million times a day”. And do make a point of reading the bit about performance. Do make a point of reading the article; it’ll give you a good bird’s-eye perspective of its features.