1. forum and blog
1.1 one poster launch a hot topic, this poster is the topic owner
1.2 topic owner mark the topic as entry of his blog
1.3 other poster view the topic in forum as tree
1.4 other poster view the blog, all followed post are shown as comments.

2. forum and wiki
2.1 topic owner launch a hot disccussion on coding trick
2.2 other poster response a lot of details, suggestions and/or criticism
2.3 some one said good discussion, let's co-write a good summary
2.4 topic owner set the initial post as wiki entry, assign a key word
2.5 topic owner grant all disccussed poster the privilege to modify
2.6 poster view the wiki key word (by browsing or by query)
2.6.1 co-writing post is displayed, all other post are shown as disscussion affiniated.