I have an ecommerce site that has about 8 CSS files linked from the header - resulting in 8 separate http requests to the server. I consolidated all the CSS files into 1 big
The browser has to get the data somehow, so how could it not use another http request? ;-)
It's also possible though, that you'll benefit from browser caching if you're only changing one file and the other seven are unchanged.
You might try sniffing a connection between a client and the server and see what it requests.