I found a little code blurp that tells your readers when a page was last updated.  I thought this might be useful for BlogEngine and wanted to create an extension for those who weren't inclined to manually add code to their pages.  If you are interested then feel free to download this user control. 

To use this control you need to place the PageLastModified.cs and PageLastModified.cs.ascx into the ~/User controls folder and then add the following section to the top of your site.master page:

<%@ Register Src="~/User controls/PageLastModified.ascx" TagName="PageModified" TagPrefix="pm" %>

Next you can add the user control where ever you want the information displayed:

<pm:PageModified ID="pmPageLastModified" runat="server" />

The results of the user control look like:

PageLastModifiedExtension-v1.0.zip (809.00 bytes)