Good luck MartijnL, you may need it.We should probably have had a discussion about standards before opening this up. Things like:
- UDF Naming
- Documentation
- Variable names
- Function calling conventions
- Variable scope rules
A common format would make UDFs easier to understand, especially with the diversity of nationalities on this board.
We should also think about the etiquette of this forum, as it should probably be less informal than the existing ones. This forum should contain finished UDFs and nothing else. See, I've already breached the etiquette with this post 
There are other problems, like dealing with comments, requests for improvements, bug fixes and removing / updating obsolete versions.
All-in-all a big task.