Yes, in todays world, there are so many choices of PMS and really at the end of the day it depends on the organization as to which one they would like to choose based on what they really want out of it and moreover which one has gained popularity interms of user friendliness and back up support.

Unfortunately, i was unable to find any article on this since this is an internal procedure for Starwood Associates.
But the reason i would like to post this is because, when i used this it was really user friendly. Basically this online tool is linked to our Starwood preferred vendors and when you order something, this goes directly to the vendor eliminating the use of papers, and emails.
As well this has a function to input your budget for that month say for "guest room supplies and as soon as you order it, this reflects in your declining budget thus prevents you from over spending and as well cost controlling thus making it easy to achieve your rooms flowthrough.
The way this works is after the originator places the order, it goes directly to the department head for approval. Once that is done, it goes to the Financial Controller for approval and ther after the GM. This is all online and the respective person gets an automated email informing them that a new purchase order has been generated and that it needs their approval.
I feel that this system should be implemented as well in other hotel companies across the globe for reasons of cost saving, eliminating the use of paper and more importantly nothing is lost in the process for the signing of the purchase order.
Since i am currently in Japan, i a trying to install such a tool in my current hotel.