I constantly hear people whining about product placement in movies and TV, but it's never bothered me. There was a perfect example of why on Heroes tonight. Nikki/Jessica gets a letter and goes to open it, and it's clearly in a FedEx envelope. Only, instead of saying FedEx, it says SendEx. How this is any better than just leaving it FedEx, which is both easier and more realistic, is beyond me.
Even the Nissan Versa in this show, which I've seen people complain about, and which is clearly superfluous to the plot doesn't bother me, because all the references to it fit nicely with (and actually helped develop) Hiro's character.