Connecting a Arduino to FT232 I found this wonderful breakout board based on FT232. I wonder if I can use this board for connecting my arduino to a USB dongle for 3g/GPRS connection ?

From what I understand this board can be connected to the serial data pins of the arduino board. And if I connect the USB dongle to the FT232 board, I should be able to run AT commands from the arduino board.
Unfortunately, no, as the FT232 would have to act as a USB host device. A USB host shield might work if someone has written driver code to support 3G modems.