I'm seeing a pretty big mix this year also. Last year, the league at the house I bowl at was predominately Storm and Hammer. This year with some new bowlers, I'm seeing DV8 (Brutal and Hellraiser), Hammer (Arson Low Flare, Brick, First Blood, Cherry Vibe, Purple Taboo, Original Taboo, No Mercy Beat'n), Brunswick (Nexxus, Zone), Storm (Frantic, Lucid, Sync, Hy-Road, IQ Tour Pearl, Virtual Energy, VG, VG Nano, Natural Pearl), Track (919C, 505T), Roto Grip (Outlaw, Nomad Dagger, Disturbed, Critical Theory, Shout), Ebonite (Angular One, Mission X), and even some 900 Global (Bounty Hunter, Profit).
As for me, the balls getting the most use so far have been my Frantic and Outlaw. I carry my Critical Theory but have only had to use it a few times so far this season.