This version has new features, such as support of SMTP authentication, suspending delivery, ability to select custom server ports, also, it now can start up with Windows, supports numeric IP addresses, as local domain names. It does not limit the number of users. You can allow different users the access to different directories, specify their rights, allow anonymous access. It will not shut down itself after the certain amount of time. It's intuitive, simple, compact, free.
Savant provides support for most modern web features and technologies.
Best of all, SimpleServer minimizes to the system tray, so it doesn't take up valuable screen space when you're not working with it.