Nice Couponpress theme modifications. This is the latest version, I've also be messing with it a bit on a couple of others sites I'm launching soon.
Colours look good for the theme.
I would consider adding a H1 tag as its missing, possibly to the logo with title tag.
I would also wording coupons to be discounts of vouchers
I would also add a welcome/intro and put it just below the h1/h2 above the Latest Coupons section. Then in the heading tag put your primary keywords as I'm sure your primary keywords aren't 'Today's Latest Coupons'
Maybe move the Sidebar widgets around put the 'What's the Story' at the top.
Just my opinions