Most advanced Linux users with know the sysctl interface for fine-tuning the Linux kernel. But there is probably noone on earth who really understands all those parameters. Well no wonder, as they're usually not even documented.
So I just thought to myself:
It would be great to have a program which has all the values and explanations to them. It could then create configuration files and let sysctl parse them. "Linux Kernel Tuning" would be a cool name. If I had more time... ;-)