Here's a suggestion from me:
We have a Popular Deals section which lists the most popular deals in the last 7, 14, 30 & 90 days. The problem with those views is most of the old deals are expired or out of stock, etc., so if I wanted to see the most popular deals in say, the last 30 days which are active, I need to wade through the set of expired deals in the last 7, 14 and 30 days.
What would be good to have is a view of the most popular deals which are still active. This would be a good gap to fill.
Just so that I am clear why I believe this is a gap:
Popular Deals section includes a lot of expired deals
Home page includes top deals above a certain count of votes ordered by time (not votes)
Deals Expiring soon lists the deals ordered by expiry date and then votes (i.e. all deals expiring in the next day are displayed first from most popular to least popular and then all deals expiring in two day's time again from most popular to least popular)
Good idea, maybe a checkbox with active deals?