I have set up a simple review/recommendation scheme:

Place a review of my software(s) on your site (I can provide text/images if needed).
Within review have a discount code that gets your visitors/members 10% off the price of my software.
Each software purchase made using 'your' discount code earns you £1.

The softwares are:
'The Vegetable Gardeners Almanac' for vegetable growers (amateur and professional).
'The Poultry Keepers Almanac' for backyard/smallholder chicken keepers.
Each retails at £9.99 for the download and £12.99 for CD version.

See websites for software details - PM me if interested.