By default, PostNuke is not optimized for SEO, but you can easily customize it in order to increase your rank in the search engine. Indeed, multiples officials and unofficial plugins have been created in order to help you for that purpose.
Note that,- this tips could be outdated in the future.
- i will talk only about intern SEO,
- this tips can help your SEO, but can not "decrease" your rank (that's not dark SEO)
Customize title
You can customize the general title of your PostNuke, by filling in the correspondant fields in the module "settings". The problem is that, you will have only one title for the whole website ... and that's ugly (and bad for SEO).
A solution was offered by Markwest, in order to personnalize this title, on every pages.the title tag plugin
This plugin allow you to format titles like this
if you want to have shorter titles like this, you can use the other unofficial version in the comments.
If you're using pnForum, it will give you title like this
Customize meta "descriptions" and "keywords"
You can customize the meta "descriptions" and "Keywords" of you CMS, by filling in the correspondant field in the "settings" module, but with this customisation, you will have only one "description" and "keywords" fields for all the site.
In order to improve this, there are two plugin on the community repository, one for fixing the descriptions and the other one for the keywords tags.
Notes : As the Search engine were spammed by overloaded keywords tags, for most of them , they don't consider this tags anymore.
If you're using pnForum, it will give you this :Activate URL rewriting
You can activate the URL rewriting in Xanthia, go to the Xanthia module, then check the options "use short urls", and copy paste the .htaccess file from the "doc" folder to the root of you CMS.
/!\ Be careful, live search doesn't URL with more than two dashes
Notes : an improved version of the current URL rewriting is available in PostNuke 0.8.
Duplicate content
Don't duplicate links in your portal, two differents links must not point to the same content. Indeed, some search engine don't like to see multiples versions of the same page on a website (that's called "duplicate content") To avoid this, you can use a robots.txt at the root of the CMS
An other tip, "/index.php", "/index.html" and "/" redirect to the same page so you can add this rule in you .htaccess
Text formating
In your articles or templates, try to have a structured layout with H1, H2, H3 tags.
Autolink and intern link
The module "autolink" is interesting, because he allows you to create a large amount of intern links with the same source anchor, this will help to increase your rank on the given word
404 error
When you've got an important portal with a large number of pages , it may be possible some of you ranked pages doesn't exist anymore. When search engine bots come to look for this "ghost" pages, you can redirect them to the home of your website, with an "Error 404" header.
Take off unused metas tags
For most of them, search engine bots don't read some meta like "revist-after", so you can take them of your head tags. It will not help you, but you will have a cleaner header.
This article is a translation from this "how to" released on Postnuke-France

5 Comments so far
(Latest comments
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1. kaffeeringe.de wrote on Feb 04, 2008 at 09:23 AM
Hi Mumuri!Thank you very much for your article! Although SEO sometime seems to be the 21st century version of Alchemy: There are some nice tipps in it.
The idea with customized meta-decriptions is nice - Google's webmaster tools suggest that they are still of value to them. And I already thought about how to fix it.
2. kaffeeringe.de wrote on Feb 04, 2008 at 09:25 AM
Oh I forgot: Are the improved titles really better? I mean: title is a pretty important tag and it's content is regarded valuable. So IMHO it's a good place to store important words.3. mumuri wrote on Feb 04, 2008 at 01:56 PM
thanks for this comment (i was affraid you didn't like it see)it works well on my discussion board ^^ (but i didn't do any comparison)
and even without thinking about seo, don't you think the users like a short and clear title in theirs results rather than a long
one
4. mumuri wrote on Feb 25, 2008 at 10:38 PM
one last think, if you offer a RSS xml version of your new, cut the description, some feeds leecher are using to create an articifial content for their website.5. mumuri wrote on Mar 30, 2008 at 06:41 PM
more information about custom titles (see 58)
http://www.searchenginegenie.com/seo-blog/2008/03/150-questions-answered-by-google.html