For fuck's sake, please, this is not difficult! Sign your posts with (~~~~) or (if that's too fucking hard) by clicking on the fucking sign BUTTON: on the toolbar above the edit panel. (You can indent successive talk page comments using one more colon (:) for each line.) This keeps the place tidy and stops you looking like a complete arsing tool so please, just fucking do it already.
This is a template message useful for reminding editors to sign, because we've all felt like this at one point or another.
It should almost always be substituted, for various reasons (preventing vandalism, avoiding newbie confusion, etc):