keep your fingers away from the brake levers while cornering.
If you need to slow in the corners, slow first, take your fingers away from the levers, and accelerate out. If you brake in a corner you're much more likely to slide if it's wet, especially if there are things like paint stripes or manhole covers.
And if you flat and get a neutral wheel, don't count on it having the same traction as the ones you brought-- I found that out the hard way last summer.