hi Mike,
 

> add the ability to do simple summation and date math on fields ( I will 
> defintely look into Tobias' "let" plugin ... hadn't noticed that before)
>

Atm, letfilter needs a few more features 
<http://let.tiddlyspot.com/#Syntax%20Changes> to do the kind of summation 
required for adding up invoice positions and do some 
total_sum(item_sum(quantity*unit_price*tax_rate)).

I will happily share it here once I clean out my personal details (it is a 
> good historical record of your entire employment history :] ) and make it 
> generic. I would love to have someone else hacking on it to make it more 
> functional.
>
 

Expect some sort of GoogleDrive/TiddleSpace/TiddlySpot link here in the 
> next day or so. I have been meaning to do so for a long time now as I've 
> found it quite useful and figured others would benefit from it.


Please do. People will pick it up and have it evolve.

Best wishes, Tobias.

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