Yeah, put your css files in one place. Its neater for someone else to
come along and adjust your site if they have not seen it before.
Figure out a organization scheme and keep to it. This way precaching
is easier, some people dick around with the url to their style rules or
images by continually making new folders to store different types of
image content or whatever and this prevents
effective caching by the browsers (if the directory path to a file is
different in anyway the browser assumes that its a new image or file).
So always keep to a scheme thats tidy and convenient for you eg:
seperation of all different file types.