Actually, aside from the fact that Rodney just started this thread so he could talk about his favorite part of the anatomy, he raises a very good question. I work for immigration at the airport, and a lot of women from less-developed countries (or, one could argue, countries where mammaries are just mammaries and not a sexual object) have no qualms having a boob hang out and a kid sucking on it while they're answering questions that will or will not let them into the country!
I think as a general rule of thumb, subtly is key, however there are certain places where breast feeding is just inappropriate and/or distracting. (i.e. fine dining, the theatre - where babies shouldn't be anyway, a classroom, etc.)
BTW - a 5 year old still getting breastfed??? WTF???
"It's not always about you!!!" (But if you think I'm referring to you anyway, then I probably am.)
"Good luck returning my ass!" - Wilhemina Slater
"This is my breakfast, lunch and f***ing dinner right here. I'm not even f***in' joking." - Colin Farrell