how do we manage contributors?

I'm asking for feedback on this one so please comment!

here are some ideas for how we can manage contributors:

Plan 1
- Each library would have one log in for the liaison and the providers
- people would "sign" their posts so we know who wrote what
- labels could be created for individuals so we could easily find who wrote what
- Contributor list would remain on front page (list of partner libraries + random individuals who had log ins already)

Plan 2
- individual contributors would have log ins, created as needed (i'm assuming not all 300+ providers are going to want to post... and people can comment without needing a log in)
- contributors list would NOT appear on the front page if it got really long
- people wouldn't have to sign their posts because with individual log ins, the author is automatically noted at the end of the post

Plan 3
something else I haven't thought of yet