What is "Postgresql Hot"?

I've not been following up on the list for some time now, and recently
re-subscribed. There is some talk of "Postgresql Hot" which appears to
be a hot backup solution that may be included in 8.3

* How is it different from the current Perl script out there?
* Can't pg_dump already give us hot backups?

Regards
- Ericson Smith
Developer
http://www.funadvice.com