Very interesting design structure you have chosen there, I wasn't initially a fan but after a few minutes of browsing your site I quite liked it!
As always, I'll give my honest feedback below, take it as you please:
1. In the best offers section it simply has the banners which frequent gamblers see on a lot of on other websites. My initial impression from .gif banners is that they are very short and don't explain how to claim the bonus.
I'd write brief descriptions about how to claim the bonus, why to join etc. and have a nice little sign-up button. I did that with a few of my other sites as well as the banners and people preferred to click on them.
2. I'd segregate the offers section into categories. For example:
Match-up bonuses
No-deposit bonuses
etc...
Any specific questions please let me know
Cheers,
Dave