PostgreSQL 9.0 Final Release Available Now

Can anybody point to a good discussion about the strengths and weaknesses of PostgreSQL relative to MySQL? Or can you weigh in briefly about the tradeoffs between the two?<p>EDIT: Okay, must've touched a few nerves there. Sorry. Question was asked in earnest.

Yesterday's thread discussing 9.0: <a href="http://news.ycombinator.com/item?id=1706030" rel="nofollow">http://news.ycombinator.com/item?id=1706030</a>

Full release notes <a href="http://www.postgresql.org/docs/9.0/static/release-9-0" rel="nofollow">http://www.postgresql.org/docs/9.0/static/release-9-0</a>

Has anyone been using PostGIS with the RCs? Is it stable and ready for production?

Why use hot-standby over streaming replication or visa-versa?