OpenOffice.org Calc and Writer have the usual editing features that let you send files out for edit and get redlined comments back from anyone who reviewed it.
However, not so much for Impress presentations. Not within OpenOffice, anyway. Fortunately, there are a few ways around this, including SlideShare. They support OpenOffice.org Impress files as well as PowerPoint. You can share, tag, and get comments back.
You can also take a look at this extension for OpenOffice Impress. O3Spaces works by providing users a single web-based team environment, with built-in search capabilities and an optional Java-based Desktop Assistant.
Their web site says "O3Spaces technology enhances OpenOffice.org and StarOffice with an integrated solution for Collaboration, Document Management and Document Retention within teams and small businesses. O3Spaces provides the OpenOffice 2.0 and StarOffice user community with a professional out-of-the-box extension for team and project collaboration, O3Spaces means an affordable and integrated alternative for MS Office Sharepoint."