Each topic could graphically display it's favour or disfavour using a simple sliding bar or even a colour scale as the background colour for the topic on the page.
The colour of the top banner should be based on the most recent one hundred votes rather than the entire set so it's more likely each vote is likely to impact the banner and it's more indicative or the mood 'at the moment'.
Rather than having multiple pages of topics, add facebook-style page resizing. ie: get to bottom of page, browser detects this and prompts get request for more topics which get appended to bottom of page.
