I have a few quick questions. I have used Macs for about two years now but after reading about key logging and identity theft and all sorts of crazy stuff, I started to wonder. Anyway, could anyone answer any of these quick questions for me - 1) I know viruses and spyware cant run on Mac because obviously they are designed to run on Windows, but can they be passed on from PC to Mac and then visa versa without it being the original infected file that is being transferred, if you know what I mean? Mainly because I do a lot of quick design stuff where people send me CD's and emails with images and info on it, and then I send back updated stuff etc, so it is more just for my peace of mind. 2) I assume keylogging acts just like a virus too, so I never have to worry about that for the time being, right? 3) Should I have the built in Firewall on? What are the benefits / cons? I am connected to bit torrent but apart from downloading the odd legal anime I dont use it much at all really so downloading isnt much of an issue. 4) I have a room mate (shared building) who has a Mac too (iBook) and since I am the one connected to the broadband I let him access the internet through my iMacs built in aiport by me going and creating a network through Sharing in perferences. While I use my Mac mainly for professional stuff and generally keep to a set of safe websites (graphic design and music mainly) I am never that worried about picking anything up, but I have no idea what perverted stuff he could be getting up to, so is there any risk of files or other stuff coming onto my machine while it is sharing? I know he has downloaded music and my iTunes has popped up with a Limewire section, which he promptly got a bitching at about, but I made me wonder if anything else has come through. Or if it is my IP address and not his that would be showing up! Can anyone shead some light on that? Many thanks in advance!