If fishing from a boat buy a waterproof Sportsman Dry Box, K-mart and Wal-Mart carry them, to keep your wallet, important papers, flares, sounding device and camera in.
Carry a tube of super glue in your tackle box and use a small drop to also repair plastic baits.
To keep your fishing maps from being destroyed. Cover both sides with clear contact paper. This makes them waterproof, and allows you to mark choice locations with waterproof grease pencil. Use a dry cloth to wipe off the markings later.
Looking for small screws for quick reel repairs? Look no further than a cassette tape. The screws are usually the right size.
Safety pins help keep things together. Slide spare blades, hooks, swivels and the like onto the pin, and snap the pin shut. Now you don't have to worry about them scattering all over your tackle box.
Use an outdoor digital thermometer, the kind with the 10-12 foot lead. Drop the probe down and you can measure the water temp down to 10 or so feet, instead of just at the surface.
Use glittered fabric paints or glittered finger nail polish to jazz up your baits.
Use your local bait fish as a guide to size and color selection for your lures.
Using a lighter test fishing line can help improve the fish strikes.
Sharpen hooks just before use for more positive hookups.
Varying the retrieve speed or combining a quick retrieve with a pause to let the lure sink a few feet down in the water before continuing the retrieve can stimulate more strikes.
A different lure presentation (size or type) from what is normally used in a particular area can also help improve the fish strikes.