This is why I don't park my car in the street in the city, I'd rather pay for the garage as long as it's a park-it-yourself garage. Actually, this is why I don't take my car into the city at all if it's at all avoidable.
I feel for you, but take a look at that picture of the street where you parked your car. Does it really look like a place where you'd wanna park your G and leave it?
Now, as far as fixing it goes, I got a product called Langka. It works with (and only with) factory touch-up paints and only if the chip is deep enough to hold paint. You fill the chip with touch-up paint so that it leaves a little bubble or bump on the surface. Then, you take a cotton cloth (like an old t-shirt or something) and put it over the included plastic card. You then apply Langka to the cloth and rub the paint "bump". The Langka solution disolves the touch-up paint on the surface. You keep rubbing until the bump is perfectly smooth with the rest of the body surface and then wipe away the excess with a clean cloth. Voila, it's perfect again.
Check it out at
http://www.langka.com/
Once caveat is that the chip has to be deep enough to hold paint or else the Langka just removes all of the touch up paint. Therefore it's not useful for removing really small chips. If you have a larger chip that isn't that deep, you can make it deeper using a sharp tool to cut/scrape down deeper into the paint so that the touch-up paint will hold.
I've done the wet-sand thing before on my last car. It's a whole lot of work, sometimes a couple of hours of sanding/polishing. Langka is far less work - a few minutes literally from the time the touch-up paint is dry.
Good luck. Oh, and the person who was driving that Lexus is obviously an ass and should be shot. However, I'm not sure it's legal to post his/her plate number openly on the Internet like this.
oh no, my G35
. Thanks. 
