Here's a tip on how to increase the life of old wooden gutters. The first step is to lay a new rubber liner along the inside of the gutter. Adding copper flashing along the edge seals the liner, adds extra durability, and allows water to run off easily. Finally, add a second strip of rubber on top of the flashing for extra protection.
For more on gutters and drainage, consider:
French Drains 101
5 Things to Do with… Gutters
Quick Tip: Cleaning Your Gutters