Ugh. According the NY Times, advertisers are stepping up their car-wrapping campaigns, which offer free cars or monthly stipends of up to $800 to folks willing to turn their vehicles into rolling billboards for Coca-Cola, Jamba Juice, whatever. Ad-wrapped personal vehicles have been around for more than a decade, but with fewer people reading newspapers and magazines, the trend is accelerating. Of course, you have to pledge to abide by some potentially lifestyle-altering rules, such as not-smoking in your vehicle and not parking in front of businesses that sell the competition's products. So if you're driving a Coke car, no visiting Taco Bell or Pizza Hut. Still, a free car is a free car. I must guiltily admit that I'd probably take one, if the ride was sweet and product was cool. But you have to ponder whether we'll ever reach the tipping-point on advertising, says the guy with ads on his blog.