Main layout CSS div's:

    * div id="container" - this is used to wrap the header and content-holder (including sidebar). If you want you can move the footer inside this div as well. Div's that are children of container include:
          o div id="header"
          o div id="content-holder"
    * div id="header" - this houses all the header content including:
          o div id="header-inner" - used if you would like a full page layout but a defined width for the actual content.
          o div id="logo"
          o div id="search-header"
          o div id="searchform"
    * div id="content-holder" - this houses the sites main content including the sidebar. There are two types of layout, 2 column (splitpane) or single page.
          o div id="content-holder-inner" - used if you would like a full page layout but a defined width for the actual content.
          o div id="splitpane-content" - the actual site content when a sidebar is employed.
          o div id="splitpane-sidebar" - holds the sidebar information.
          o div id="single-page" - presents the information in a single page i.e. no sidebar.
    * div id="footer" - this houses all the footer content including:
          o div id="footer-inner" - used if you would like a full page layout but a defined width for the actual content.

Note: the toolbar has it's own CSS located in mod/toolbar/css
Here is a list of the other div's that are used to control appearance of the components houses in content-holder:

These are all located within 'splitpane-sidebar':

    * id #sidebar_user - this hold the small profile box located in the sidebar
    * id #me - holds the users information
    * id #icon - the user icon
    * id #contents - the page owners details
    * class .userdetails - the tags, resources and rss links
    * class .usermenu - the friend/unfriend link
    * id #recent_activity - the recent activity link.
    * id #community_owned - community the user owns
    * id #community_membership - communities the user is a member off
    * id #sidebar_friends - the users friends
    * id #sidebar_files - the users files 

Blogging engine div's:

    * class .weblog-post - this wrap each individual blog post
    * class .user - this holds the user icon of the post owner
    * class .weblog_keywords - this is the blog post tags
    * class .weblog-title - the blog title
    * class .post - the actual blog content
    * class .info - the blog post details, who posted it plus the edit and delete links
    * class .weblog_dateheader - date the post was made
    * id #comments - wraps all the comments for a particular post
    * class .comment-owner - this is the details of the person who made the comment plus a perma link to the comment

Div's not used but available:

    * id #view_own_blog - this wraps your entire blog and can be used to make the view you have of your blog different from what others see. For example; some people don't like their icon to appear on all of their own posts - use this div to hide the icon when you are viewing the page, others will still see the icon.

Sub Menu div's:

    * id #sub-menu - this displays the sub menu navigation options.