People sometimes ask if they can make a donation for the program.
Instead of money, there are three other things you can do that I'd appreciate much more.
1. Encourage people to use HotkeyNet by posting on forums, by talking about it in games, and by teaching friends to use it
2. If you've used Keyclone, go to the following thread on Dual-boxing.com and compare the two programs:
Keyclone or HotkeyNet?
3. Plug HotkeyNet on StumbleUpon, Digg, etc.