About a month ago I produced a beta version of an add-in called AudXL. It’s a formula auditing tool which makes loooong worksheet formulas more readable:
I’m happy enough with the results it produces to release it as version 1.10.
The source code is unprotected, so rip all you want for your own projects.
Download AudXL.zip from my website: http://www.vangelder.co.nz/excel