I do two things currently to monetize the site (actually just my blog): AdSense and an affiliate link for my book. In September this resulted in:
1. £24.73 ($38.88) in AdSense revenue
2. 724 clicks on the affiliate link resulting in £27.39 ($43.08) in revenue from Amazon.com
So I made a total of £52.13 ($81.96) from my site in September.
Could I do better? If so, how?