The biggest hold up is a lack of schedule trigger.
With the huge variation or complete lack of cron abilities of many hosts (some only have once an hour as the minimum interval, others like E-Rice have none), I have not come up with a solid easy to support method of doing this.
Ideally, there would be a simple easy to setup, inexpensive win tool you could use that you could point to the website and a specific php script and set the timing interval to what you want and be done.
Setting up a task scheduler is difficult to support especially for people who have never done that before.
So while the scripts themselves for displaying the info are basically easy to provide, without an easy to use trigger that is easy to support it is hard to release.
I actually wrote a small Win utility to do this, but it needs a bit more work and I have no time to work on it.