These CSS classes are defined in the module.css file. You can see the one for DotNetNuke.com here:

http://www.dotnetnuke.com/DesktopModules/Blog/module.css

Best practice would be to identify the classes you want to change and copy them to your skin's CSS file. SKin css files will load after module css files giving you the opportunity to change the style without modifying the core module css and future proofing your upgrades.

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Steven Webster
Manager, Community Platform
F5 Networks, DevCentral

Thanks.  I managed to style the main blog viewing module, but I am still lost on how to style the Categories module and Recent Posts module..  I believe the categories module is done using ViewCategories.ascx.  This is the line of code from that file:

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="ViewCategories.ascx.vb" Inherits="DotNetNuke.Modules.Blog.ViewCategories" %>
<asp:TreeView ID="tvCategories" runat="server" ShowLines="False" ShowExpandCollapse="False" CssClass="CommandButton" />

These IDs and classes don't exist in module.css.  Any idea where these might be at?  I think I've looked all over the blog directory for these .css files, but no luck.