Server with multiple connections, fork() or select(...)?

Hi,

I'm *trying* to create a ftp server of commercial quallity, don't know yet if it will be open source, but probably for free.
It must be able to handle multiple clients, use low system resources, work for linux/windows, ... being the perfect little server :cool:
It must mainly work for linux. What is the best way to handle multiple connections? fork() or select(...)?

Are there some special features that you would like to see in a ftp server? Or do I need to pay attention to something special?

Big Thanks,

Walter Brebels