In preparing for Drupal 7 we need to review our existing Installation docs (http://drupal.org/getting-started/install) to see what has changed between D6 and D7. We'll need to add any D7-specific information to it. Aside from the technical review/update of the guide it also needs to be reviewed for style guide, grammar, etc. This issue should be used to track the review and note when it is complete.
Ideal deadline is complete before August 14, 2009
This is part of the Drupal 7 documentation effort: http://drupal.org/node/515870