The anonymity here (on internet) can be used to ones advantage.
On this thread I expect to see all
"picked & corrected grammatical mistakes in my postings" (& postings of other users .. if they volunteer too) .. you come across on PG.com.
For your help, I have given a link to this thread in my signature also.
I expect similar deed from other users also so that by pointing each others mistake we can learn in an easy way.
ALSO .. point a mistake only if you believe it is UNINTENTIONAL .. like there are many mistakes we are doing knowingly .. including the spelling mistakes ..
So get going Sherlock ..
PS - I think its understood that "Rather than emphasising on a person, EMPHASISE on the mistake !!"