Thats it really. New posters need a bit of extra help with acronyms, site etiquette and in the case of trolls it'd be nice to realise when somethings a new poster so it can be taken into consideration when replying.
On moneysavingexpert forums they have a 'warning newbie poster, go gentle' tag.
Why? Do be honest, I don't agree at all. I don't like marking posters out as new it's along the same lines as threads viewed etc, I think the potential is there to have a two tier MN with established posters & new. It doesn't sit well with me.
Posters should treat what people have written the same no matter how long posters have been here.