MdnIte
Graffiti has been done since Roman Times. Why stop now?
Anyone thinking of the Life of Brian right now? Hahahahahah
I'd also like to say a little about 'going over' or 'crossing' which was mentioned a couple posts back. When someone disrespects by going over a piece with a tag, there is always a reason. There is beef between the writers so one dude tags over the other dudes work. There are gangs and crews, and this is a common part of innercity graffiti culture. Bottom line is that if you go over someone's work, you are either getting them back for something or are trying to tell them something. Either way, you will get it back, someone will cross somehting of yours or you will simply get your teeth knocked out.
There are kids who just cross other people to start shtuff, to get a rep as a badass guy who crosses, but those kinds of writers never last because they get their asses kicked in or they simply drop out because they get ignored.
Delirious: there is no definition of good and bad graffiti. It's all opinions, like any other art. I see a throw and I am sort of disgusted by the impersonal level of art is has. There was a quick one-colour fill and then a line outline. Nothing fun, nothing special. But then there are graffiti artists who marvel at a well-crafted throw or tag. Not my cup of tea, and to anyone outside the graffiti world, it's pretty ugly.
The whole debate of getting permission: unfortunately it is not easy as that. The public doesn't really like the look of graffiti because of the destructive connotations it has to it. That's where I try to change people's minds. If more people appreciate how good graffiti looks, the more it will become accepted.
ND4SPD, here are some of my prefered drawings.
Some mostly marker sketches.

This one is intended for a wall somewhere. I cannot see how someone can get mad at this style of graff.

Some basic graphic design/presentation work with this one:
Here is some graffiti-related art that I have also done.
Inspired by a Shepard Fairy poster (the
Obey artist)

Follow-up poster:

A canvas-style piece reading MAKE REAL ART (my personal slogan)

Graffiti-related cartoon strip inspired by
Vaughn Bode's Deadbone cartoon lizards:

4x8 of drywall in my backyard a week or two ago.
Enjoy.