The proper way to set up your directory stucture for web serving

I'm having a brain seizure, and i'm looking for some direction on the
'BEST' way of organizing web document directories.

I'm on V5R3, using apache for static pages and some homespun CGI (the
hard way) programs.

I want to begin using net.data and CGIDEV as well, and I'm having
difficulty deciding the proper way to set up my directory structure,
but before I do, I want to make sure I don't paint myself into a
corner by doing it wrong.

How do you all organize your directories?     by document type and
then application?  or by application and document type.  What about
images, static pages or net.data macros that could be used in several
different applications?

Mostly, I'm concerned about my html (static and generated) will be
able to easily 'find' my images, other pages, other links, etc.
without having to specify full path's to those objects, and to easily
navigate between static pages, cgi and net.data links.

for instance, can you think of anything functionally different between
the following:

/live/common/html/...
/live/common/images/...
/live/common/netdatamacros/...
/live/application1/html/...
/live/application1/images/...
/live/application1/netdatamacros/...
/live/application2/html/...
/live/application2/images/...
/live/application2/netdatamacros/...
/test/application1/html/...
/test/application1/images/...
/test/application1/netdatamacros/...
/test/application2/html/...
/test/application2/images/...
/test/application2/netdatamacros/...

and this:?

/live/html/common/...
/live/html/application1/...
/live/html/application2/...
/live/netdatamacros/common/...
/live/netdatamacros/application1/...
/live/netdatamacros/application2/...

etc.

or some other way of organizing?

thanks in advance,

Rick