hehe, pleased to see all of this is creating a bit of debate here
You like msn, well I do too : http://search.msn.fr/results.aspx?q=php ... H&cp=65001
Many parameters are to be taken care of while trying to get well indexed. And getting indexed is just the begining of showing up in good positions in search engines.
Here is another example : http://www.google.fr/search?hl=fr&q=stu ... cher&meta=
This is second out of 22 500 000 results on google, not that bad for a site that's not even finished yet
http://www.google.fr/search?hl=fr&q=ele ... cher&meta=
So, yes this mod is helping, but not for the whole job to get you there, many things are playing a role, and the role of this mod is to facilitate google bots work (and thus many others search engines such as aol etc ... using google) and any other bot that will discover it (a link is good to do so).
As I previously explained, this mod will optimise usefullness of each bot visit, since they'll be able to find (and see what's updated) up to 50 000 url in one shot, what could possibly be more efficient ?
Usually major bots comes 4 or 5 times a day on my board, so it's a lot more efficient if all of those visit leads to a page being either cached or updated (we waist very few url listing here, after one shots per forum, search engines knows all).
My experience with this system is that you really end up being indexed faster and better, now, as said too, many other things are to be done in order to actually see all this leading to more visitors on our sites.
http://www.google.fr/search?hl=fr&q=sit ... cher&meta=
http://search.msn.com/results.aspx?q=si ... rch_type=0
http://fr.search.yahoo.com/search?p=sit ... meta=vl%3D
No need to say I'll soon be talking more precisely about all this ...