As I mentioned in your intro post, I love the way you've set up the anomalies! I think that'd a great way to go about keeping things from getting stale and keeping the game moving.
I think you've got the right idea about hoe the RP goes as well. Usually in my experience all the posts went into the main rp, which in this case would be the Primeval_RP journal. And then the characters were free to use their respective journals for their character's thoughts or notes to other characters and what not. Usually they'd specify if the journal was private or aimed at a specific person and so on. It's loads of fun, really!
Also generally there was a set up for the rp posts, like a format so all the information was organised. It usually went something like:
Title: Time/Place: Characters:
etc. all that important info, and then the post behind a cut, and viola! And we should remember to tag our posts so everything doesn't get all cluttered.
Excited for Monday, then! I hope other people join in!