Since I get to see a lot of different sites from different angles (and to see which ones actually perform well), I would have to say this site is very good and I don’t think there is much to change. Some sites that are dense with info and text do well because it appeals to a certain crowd while turning off others. If you do add more space to make the page less dense I am not sure the effect that will have on that. Because there doesn’t seem to be 1 item left out your viewers might be inclined to scan the entire page to find something that attracts them, which I think is a good and bad thing. Here you could get away with that, or an alternative would be to add one item somewhere on the page that grabs your attention first. If this site is more community based than information based, then perhaps more space would help the site out. Since the site is jackpotfinder I would assume your viewers are looking for some places to play for some big jackpots right away. I would suggest a section listing the top 3 or top 5 places to play for jackpots should be located on the page such that it grabs the attention immediately. Call to action for those people.
I hope any of that helps.
John