Just a brief note - I'll be giving a talk at the Southern California Linux Expo this weekend http://www.socallinuxexpo.com/scale5x/
The talk will cover some of what's new in OpenLDAP 2.4, present some more benchmark results, and some other related topics. (Yes, OpenLDAP 2.3 *was* the fastest LDAP server we've ever tested. 2.4 is even faster...)
Come by and say Hi if you're in the area...