I recently created https://dappclap.com and i've been watching these dapps for the last couple days.
The main apps that seem to be taking off and doing the most volume are Idle Games like Ether Goo and RigWars -- And Proof of Hodling dapps like powh 3d. Cryptocuddles looks like it might be good if more people start using it.
My favorite so far is ether goo. It's a fun game, but could be a little better if the tx weren't so slow. It's well done though.
What dapps are you guys using?