After some work I ported my portal to version 1.1 of the .NET Framework. The only change related to the update of the frameework was due to XSLT and the usage of a deprecated method. Cool.
I also added some new functionnalities like RSS feed for Articles, How Tos and News. Thanks to the RSS library from AdamKinney. There are also new features from the administration side like the possibilities to post news from an InfoPath form.
Now it is time for testing before going live with it.