ldapdns is a robust DNS server that forwards DNS requests to your LDAP directory. This means that changes to your LDAP directory will take affect immediately (no intermediate commands to run, and no cron jobs to wait for).
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
There are bugfixes for the *bsdish systems (handling of mktime) and initial Debian support. There were also some changes made that will affect (hopefully positively) the use of AXFR, so if you use AXFR, do upgrade. For everyone else, it's completely optional.