Chris Pratley provides a good overview of what product management is all about, first because you need to frame your decisions in a business context, and then because it's easy to ask for, say, "RSS support," but it's harder to define the actual usage scenarios you're going to address:

"First a word of caution - don’t let your enthusiasm for blogging carry you away. We're a business, so we don't do stuff because "its cool", or "I'd love it" or "blogging and RSS *rules* so all apps must support it". Or "Blogging is the answer. Now what was the question?" You have to make a business justification for the feature and your approach.

[...] What's the scenario? Are you writing single entries in OneNote and publishing them, then forgetting them (like Word docs)? Or are you keeping a OneNote section that matches your blog one page per entry, so at any time you can change or update past entries and upload the changes in bulk? If we are consuming RSS, do we have a feed going directly into a OneNote section? If so, does that scale to hundreds or thousands of items? Are we blogging for fun, or for business?"