A lot of DotNetNuke developers/webmasters forget the importance of traffic derived from their blogs or RSS feeds. Any seach engine optimization plan should include submitting links to popular blog/news feed directories.
For those who are unaware, you can enable syndication within several DotNetNuke modules. For example, in the Text/HTML module Settings > Page Settings > Basic Settings is Allow Syndicate checkbox. If this is enabled, a XML icon will appear on the rendered page.
There are also many DotNetNuke modules that provide RSS feeds for syndication. A couple of my favorite modules are Orizonti's NukeNews and Scott Schecter's NukeSyndicate. Both of these modules provide a RSS feed for consumption. NukeSyndicate allow for posting audio and video files, know as podcast and vodcast...more on this later 
Recently I spent a few hours submitting this blog to many directories. Most of the links below do not require reciprocal links, but in order to satisfy those who do and to provide a resource for others, here is the list I submitted our RSS feed to:
If you have any other suggestions, please do tell! Check back for updates....