Here is an example theme.info file to reference formatting for declaring page regions and style sheets custom to that theme.
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; $Id: theme-name-here.info,v 1.0 2009/mn/dy 02:30:57 Exp $
name = theme-name-here
description = Custom theme for web site
version = VERSION
core = 6.x
engine = phptemplate

; Information added by drupal.org packaging script on 2009-09-16
version = "6.14"
project = "drupal"
datestamp = "1253130027"

; Declare custom page regions
regions[header] = Header
regions[nav] = Navigation
regions[sidebarleft] = SidebarLeft
regions[sidebarright] = SidebarRight
regions[content] = Content
regions[footer] = Footer

; Declare custom style sheets
stylesheets[all][] = style.css
stylesheets[all][] = nav.css