I tend to keep my macbook pro, bought a year ago, on more or less constantly, putting it to sleep at night. I frequently have VMware Fusion running XP on it then. I almost never access the internet on the PC side (unless I'm checking the compatibility of a web page). My router has a firewall on it. I use gmail and follow the usual precautions against opening strange documents, etc. (I also have a supplemental fan sitting under it) I have no virus or malware or spyware protection on either the mac or the PC, although I do run occasional checks for them and have never found anything suspicious. my question: am I living dangerously by having the pc "running" all the time? or the mac?