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There is GANTTzilla.com. Upload & View: Open your Microsoft Project and Planner files right in the web browser! Edit: Edit projects using Gantt or PERT views. And yes, we do version control for your documents ;) Export: Use converters to quickly export documents into other project formats as well as PDF or PNG. Share: Share ...

You might check out Evernote. It's usually not thought of as a "project blog" but it meets all the requirements you list. You can link notes in Wiki style You can permission access to notes You can share notes publicly or privately Evernote also just launched their business version which might provide some additional features to help manage your work ...