BlogEngine.Net provides quite a lot of very rich functionality, but the rich functionality is not documented as extensively.  I've tried to put together a list of all the types of links that BlogEngine.Net supports.

Posts

• http://tim-stanley.com displays the home page.  The home page can be configured to show a specific page, or the most recent list of posts.
• http://tim-stanley.com/post/{Post-Name}.aspx displays a specific post.
• http://tim-stanley.com/2008/Default.aspx displays posts for a specific year.
• http://tim-stanley.com/2008/03/Default.aspx displays posts for a specific month.
• http://tim-stanley.com/2008/03/07/Default.aspx displays posts for a specific date.

Pages

• http://tim-stanley.com/pages/{Page-Name}.aspx displays a specific page.

Categories

• http://tim-stanley.com/category/{Category-Name}.aspx displays a list of posts with the named category.

RSS Feeds

• http://tim-stanley.com/syndication.axd
• http://tim-stanley.com/category/syndication.axd?category={GUID} category syndication feed.
• http://tim-stanley.com/syndication.axd?post={GUID} - comment syndication feed.

Special Links

• http://tim-stanley.com/archive.aspx displays a list of archives grouped by category.
• http://tim-stanley.com/contact.aspx displays a contact e-mail entry form.
• http://tim-stanley.com/error404.aspx displays the custom file not found error page.

AXD Handlers

• http://tim-stanley.com/file.axd used for file downloads.
• http://tim-stanley.com/image.axd used for images, i.e. src="/image.axd?picture=SomeImage.jpg".
• http://tim-stanley.com/syndication.axd used for RSS feeds.
• http://www.tim-stanley.com/sitemap.axd used in robots.txt to create a sitemap for search services.
• http://tim-stanley.com/trackback.axd 
• http://tim-stanley.com/pingback.axd 
• http://tim-stanley.com/opensearch.axd used for open search results.  If the link was found by a search result from another site, the site will display other "similar" pages that match the search criteria.
• http://tim-stanley.com/metaweblog.axd used for MetaWeblog API defined at XMLRPC.com for services like Windows Live Writer, Flickr, Google Docs and others services to allow post, edit, or deleted posts or pages on a site.
• http://tim-stanley.com/rsd.axd RSD handler used to publish the links used by services to read, edit, or work with the site.
• http://tim-stanley.com/css.axd CSS compression handler.
• http://tim-stanley.com/js.axd JavaScript compression handler, i.e. src="/js.axd?path=%2fblog.js".
• http://tim-stanley.com/rating.axd rating feedback handler.
• http://tim-stanley.com/opml.axd handler for OPML at OPML.org that allows sharing of site information.
• http://tim-stanley.com/monster.axd 
• http://tim-stanley.com/blogml.axd blog export / import XML standard at blogml.org.  Supported on engines like CommunityServer, Subtext, DasBlog, .Text, and others.
• http://tim-stanley.com/sioc.axd handler for SIOC that allows sharing of data based on profiles for content, author, comments, and sites.  Read more on the SIOC Implementation for BlogEngine.Net.
• http://tim-stanley.com/apml.axd handler for APML.