on capitalization, I like this lots:

https://en.bitcoin.it/wiki/Introduction#Capitalization_.2F_Nomenclature

Accepted practice is to use Bitcoin (singular with an upper case letter B) to label the protocol, software, and community, and bitcoins (with a lower case b) to label units of the currency.

but when it comes to the plural, I can't find solid info.  Personally I've been using bitcoin as the plural. 

"I have 5 bitcoin" instead of "I have 5 bitcoins"

then it gets hairy with fractions... do you have "0.8234 bitcoin" or "0.8234 bitcoins"

when looking at the SwC FAQ we write "Why do bitcoins have value?"  should it be "Why do bitcoin have value?" because that sounds fucked when reading it in my head.