so couple of things:

1. "users now reading" and "users now posting" when viewing a topic will update every 5 seconds to the latest status. so when you're typing up your message, you can see who's reading/posting
2. same thing on the polls
3. same thing on viewing the forum
4. if there's a new post as you're sitting at the bottom of the "view thread" page, a message will pop up telling you how many new posts there area
5. top picture now cycles every 60 seconds without murdering your computer.

that's all for now, i'm going to be adding more ajax stuff in the future.