Well, for iphone to pc or pc to iphone, I found something called
xilisoft iphone transfer..which is free ( because what's the point of jailbreaking if we want to shell out $30 to use a basic ftp feature

It's simple and has good interface /features.
For Iphone to pc via wifi, I found something called zumocast which also is free
I know that the capability is there for two iphones to exchange files, and I know what kind of geniuses are out there..just hoping someone would drop knowledge =)
thanks