Like many situations, this is one where the best approach is to pick one style and use it consistently. My personal preference is for a single bracket >, which is what I see most often in other arenas. The main justification I'd have for it is the same as using one space after a period. Less typing, and overall fewer characters.
Whatever you decide, make sure whichever one you decide upon is added to your style guide.
I'd love to hear what tools people are using to make this easier. Anything workflow-wise I've seen has actually added time rather than streamlining things. And that's internal to doc (not cross-departmental). Wikis: they don't update regularly or with useful info. SharePoint: turns into a free for all, even using notification, where some people use and some still email attachments. Tools people are using successfully? Hit me with 'em.