I basically agree with Brew except that I feel a bit more need to be vigilant. <sarcasm>Junk Cleaners and their ilk are very helpful for people who cannot think of any other way of getting lots of ads </sarcasm> The air conditioner analogy is brilliant. I agree that Lookout is as powerful as you need, but make sure that you run full scans regularly and pay attention to the result. "stay away from shady websites" is good advice but you cannot always tell that the site is shady. If you realize that you loaded a website you shouldn't have or you are not sure, have Lookout run a full scan. Also, do not open any email attachments unless you know who sent it, you were expecting it, and it is not a .zip or .exe file. Ask your email admin what antispam service is checking your incoming messages. If s/he does not know, you may be in big trouble. Do not click a link in an email, type in the URL into your browser, its more work but way safer. If an email sounds too good to be true it probably is, and if it gives you a panicky feeling like, I better click this right away or there will be a disaster, stop and carefully consider the possibility that you are being hacked. It is fine to use free wifi in coffee shops, airports, etc but while you are connected do not type any important passwords, access any financial accounts, or download any files. When in doubt, ask yourself, if I were seriously paranoid what would I do, and then do that. Security wonks would call all of this "just use your common sense" but people who have a trusting and generous nature need to practice this stuff in order to get it right.