There is no any way to identify your kills at the moment. I'm not suggesting a scoreboard of some sort, that is not needed, but a little, white, transparent +1 appearing above your head whenever you get a kill.
It'd be nice especially in big chaoses, when bullets are all over the place, and when you spray someone who just went off the screen.
When you get a multikill from grenades, the number could just increase.

Mockup: http://www.image-share.com/upload/1140/276.png

It would stay there for two seconds, slowly raising up and getting more transparency, until it disappears. If it was this way, you could also see well continuous kills

Thoughts?

Not a bad idea. I'm not sure if this would be too cluttered by why not have the score toward your rank show above your head instead. It would be pretty satisfying to see a little "+20" or "+50" or something above your head depending on who you killed and how.

Actually, if you press delete you can see your score, kills, deaths, and...something else (i think) that I cant remember off the top of my head. EDIT: Its is the minutes played.
Also shows all other players (if any) if you are on a server.

Oh cool to know Jonahdude.
However, I'd still like this feature, the ''fk yeah im pwning'', always feels great.

I agree, that's a nice idea. It would make the connection more apparent between what you do and how it affects the rank score, e.g. killing own guys with grenades makes you lose points and stabbing with knife gives you bigger chunk of points, and so forth.

Maybe the score like how Battlefield 3 does it - centered at the bottom of the screen so it doesn't interfere with seeing what your soldier or others around you are doing and doesn't look so arcadey. Great idea though having some sort of indication of your "progress."