I am far from the first to have thought of this, and there are many others out there, but here's my pitch at it:
http://goo.gl/N5Lypd
The first tab, "Summary", is the auto-calculated summary page: you don't need to change anything on there.
Next is the "Bank" tab - for items you have stored, but are not studying yet. Items filled in here will show up on your summary page as yellow.
Next are the eight "Alt" pages - one for each of your characters.
Make a copy of the sspreadsheet ("File" menu -> "Make a copy" menuoption). Fill out at least one of those eight tabs with your character's skill levels and what you've researched, and the respective squares in your summary table will fill out in green.
There's an OnEdit() script, so that any time you change a trait from '-' to 'Researching', the research timer will fill, according to your character's skill level in that crafting area. This doesn't quite handle correctly the case where you started researching, and then your skill level changed partway through... but it does the best it can. And any time you change it from 'Researching' to 'Known', the timer will clear again.
I'm considering making a central spreadsheet, like the one by
@Cheatingdeath23 except mine would just pull the summary pages from anyone who has a similar layout of spreadsheet, using Google's ImportRange() function.
Anyone is welcome to use, reuse, and remix my spreadsheet design in their own work: I release it under CC0 and/or public domain. I'm not sure the OnEdit script will copy over if you copy the spreadsheet, but if not, just ask and I'll share here or something.
But if my spreadsheet's not what you're looking for, I've found a few others here on the forums, most of which provide a whole lot that mine doesn't:
CheatingDreath23's metalist (many users, but only one character each):
http://forums.elderscrollsonline.com/discussion/comment/809218@Keron's Crafting Helper spreadsheet (far more than just a trait tracker!):
http://forums.elderscrollsonline.com/discussion/comment/752471@Lupinemw's list:
https://docs.google.com/spreadsheet/ccc?key=0AsC3RvXpep-qdDdIbVl2OG16MG5YdURCdkZhQ3BRNEE&usp=drive_web#gid=0
Trade helper mods:
http://www.esoui.com/downloads/cat40.html
I'd also be delighted to trade traits with anyone - you can contact me ingame as
@Farrier (US Server).