I include myself in a group of thinkers in this "small" company. In order to gather suggestions and improvement ideas from my development team members, I was put in charge of mounting an Idea/Suggestion Management system.
Some of the enjoyable features are:
- provide user based (possible anonymous) suggestions mechanism
 - provide voting mechanism on suggestions
 - (optionally) mechanism to log actions taken to implement the suggestion
 
Do you use or know any such tool?