New url feature?

I was just looking at the URL's that you guys have and I was in a post and I saw this:

Code:

http://www.vbseo.com/f28/how-make-your-welcome-headers-image-7549/

Does it make a difference if the URL is .html or make it so its like a folder going straight to the index.html? Has an article been released about the advantages to this or is it just something you guys are testing out?

That has been the format used here almost since the beginning. I haven't seen any studies or write ups, but vBSEO lets you choose an almost unlimited number of variations for your URLs.

I've always used URLs ending in .html always seems to yeild great results for myself