Problem: Trying to figure out how which included file in being used for a certain section in order to override it in a template.

Bad solution #1: Using grep / built-in search tool to navigate horrible maze of "could-be" locations.

Bad solution #2: Scour for hours or ask every little question on the forums and wait.

Is there a way to enable either an application-level or PHP debugging type mode that'll spew the name of each included file to the browser? It's fine if it buggers up the output (running this on a dev server now). I'm just going crazy and spending FAR too much time chasing all of these down. (I'd rather become self-sufficient here.)

Anybody else feeling this pain / have a solution to this?

Please help!

...Failing that, I specifically seek to:
1) have product listings (categories) display in manipulatable little divs instead of tables.
2) modify product pages to my little heart's content
3) modify cart pages