Sony's released the 2.0 firmware for the PSP, which includes a Mozilla web browser. In order to update your PSP to version 2.0, you must have version 1.51 or lower currently installed on your PSP, as there are apparently some compatibility issues. The OSNews link includes a shot of the browser in action (7th comment). Read about all of the changes & fixes here, & download the 2.0 update here.