We are working on other formats like Debian, SuSE, etc. Feel free to help with these.
Database
Tiki currently runs with MySQL 4.0.* or earlier and PostgreSQL. Most of the documentation assumes you're using MySQL. Postgres users however have a page for some information.
Tikiwiki 1.9 -sirius- is moving towards support for 4.1.X with a upgrade in the ADODB layer, however 1.8.x does not support MySQL 4.1.x.
For more information on the Tiki installation process
InstallTikiHelp is there for you if anything does not work right...
MigrateToTiki exists with some useful conversion scripts