The attached spreasheet (see link below) is a constantly changing work in progress, containing fairly comprehensive electrical info that is extremely useful as the panel and other wiring progresses.

The different sheets (tabs at the bottom) include complete load analysis, with wire and switching requirements, a switch list, annunciator list, fuse block assigments, the primary wire routing runs, and locations of miscellaneous gadgets, such as over-voltage circuits, diodes, EFIS serial port assignments, relay shelf gizmo pinouts,  etc. The fields are liberally commented with explanations. Again, this is a work in progress, so it's not always accurate, much less complete.

DISCLAIMER: Like everything else on this site, the electrical spreadsheet should not be used verbatim by anyone else. It is presented here only as an example of the kinds of information it is useful to track, and one method of organizing it. Your mileage will -- and should -- vary.

The most recently posted version is from December 7, 2008.