Bubble Gum. I use the Berkley Gulp Bubble Gum Worms for trout. I know it says bass, but trout seem to love them. I rig them up with about a 2ft lead and a small sliding sinker above the lead, they already float but i put a small corky on the lead as well. This is my bank fishing setup though, i have no clue how well they would work in a lake or pond. All i do is drop it in the current and let the worm work its magic. (it has really neat movement in a current)
I'm a fan of the fake corn for trout and kokes...stays on the hook forever. The trout at Smith reservoir hit it the most, usually it slides up the hook and I've used the same piece of corn to catch 8 fish lol.
The floating salmon eggs are just as effective--if not more so--than your traditional "powerbait" rig. Especially with stocked fish if that's your cup of tea. Make sure your hook is floating up above the sinker. A small hook is the key.
I've had success with the nightcrawlers under a slip float in deeper water at a Lake in Washington and at Harriet Lake here in Oregon. I also use the bubblegum pink "saltwater" worms (I got 'em at Fisherman's Marine in North Portland) on a jig head under a float for steelhead.