Trying a lenny install the other day, I ran into LDAP problems afterwards (i.e. automatic LDAP connections/lookups weren't working, although as I recall ldapsearch worked fine).
This bug report summarises the issue - the solution is to add
ssl onto your /etc/libnss-ldap.conf file. Adding this to pam_ldap.conf if you use PAM & LDAP together may also be necessary.
(In other news: hello. Have finally gotten around to testing out the new blog system. :) )