You have probably noticed that the search engine on the postgresql site has
been up and down a lot. In order to search the mailing list archives, you
can usealtavista (www.altavista.com) with the host qualifier. In addition to
your search phrase, include the qualifier "host:www.postgresql.org" (without
quotes). Then, altavista searches only this host and lists the results.
For example, the following search produces about 14 pages.
host:www.altavista.com "date format"
Thought this might help find information on the mailing list archives more
easily.
krishna