Version 8.0.19 is a minor release containing bug fixes. Included are:

• A fix has been applied to the backend crash occurrence when the client encoding is unable to assign a localized error message.
• An incorrect tsearch2 headline is no longer produced when a single query item matches the first word of text.
• The improper display of fractional seconds in interval values, when using a non-ISO datestyle in an --enable-integer-datetimes build, has been repaired.
• A correction has been made to ecpg's parsing of CREATE USER. 

If you are running 8.0.x, a dump or restore is not required. However, if you are upgrading from a version earlier than 8.0.6, see the release notes for 8.0.6 here: http://www.postgresql.org/docs/8.0/static/release-8-0-6.html.