For me:

"Mac and Me".
"The Wizard".
"Transformers (2007)".
"Harold and Kumar go to White Castle".
"Wayne's World".
"Cast Away".
"I Robot".
"Blade Trinity".
"Superman 2".

Return of the Killer Tomatoes
Short Circuit

28 days later (every time i watch it, him drinking the pepsi makes me hope he gets infected with pepsi's "rage"; Type 2 diabetes.)
The Island
Transformers

The Island, by far.

Hmm... 'Minority Report', comes to mind

'Lord of the Rings' (sponsored by the New Zealand Tourism Board)

Any of the recent '007' films

Spider-man, when he drinks Dr. Pepper. That is one of the worst of all time.

Superman (1978) Cheerios, Timex --painfully obvious advertisements.

They've got to fund their movies some how...

Transformers
The Island
I'Robot

Ever see an Asian Drama.........their shows are nothing short but of Product placement...expecially for Nike And Puma....You see their characters wearing Nike shoes everyday with a Puma Sweatsuit...every single day.

How could we forget Kung Pow with Taco Bell and the National Dairy Farmers Association.

"Taco Bell, Taco Bell. Product placement for Taco Bell. Encherito, MACHO BURRITO!

Ha ha! and neosporin: na na na na neo na na na na sporin!

What about Taco Bell in Demolition Man... has that been mentioned?

Austin Powers 2 with the Heineken (Hi-knee... remark) hated that.

2001 a Space Oddessy...

Pan Am - Gone
Bell System - Gone
Hilton Hotel - Going Fast