M,
I think anything that adds valid content and builds community is worthy of MFI. You of all people should never feel guilty to share anything that comes from your brilliant noggin!
That being said, I don't syndicate EVERY post (a lot of them, yes, but not every one) that I put on my blog. I'm even trying to think of some MFI specific content. Problem is, with so many talented bloggers, every time I wrap my head around an idea, some one has just posted it!
Thanks for the question, M. Although we prefer original content, we realize that sometimes its too much to ask for. So a mix is always nice in that situation, like Heather suggested.