Coke Zero. Without a side-by-side comparison I'd say it tastes like Diet Coke, only maybe a little less like bubbly water. CraigA thinks the same. I still prefer Diet Vanilla Coke.

The black label and cap are cool though. Although it does look a little like they had a bunch of left over black Coke bottle caps and they stamped "ZERO" on them.

No comparison to the sweetness of Pepsi Max, which tastes great IMHO.

Looking forward to trying Coke Blak.