ok - just that I used the browser to go to youtube and it asked me if I wanted to run the javascript (or something similar) to view the videos - so i thought mmm is this telling me that there might be a risk in running this...?
Yup if someone can write a virus on the PS3 then that person would know the ins and outs of the PS3 OS so would therefore probably be able to exploit it, and obviously that hasn't happened yet