Are you familiar with Brian Tracy's continuous improvement formula, also known as the 1000% formula? The quick version is that if you improve yourself by one tenth of a percent (1/10 %) every day, in 10 years you'll have improved by 1000%, with the conclusion that you'll increase your income by the same amount.
Have a look at this 10 minute video from Brian himself:
If you're more the text-reading type, go ahead to Brian's website and read The Continuous Improvement Formula article.
Now go and read for an hour every day!