These three articles from AARP provide really useful and easy-to-understand information.
Cash Flow Control: Ten Easy Tips to Help You Make the Most of Your Money includes info about the unique risks of debit cards, and how they differ from credit cards.
Watch Your Documents Overseas includes a variety of info, e.g. guarding against theft and how to avoid excessive cell phone charges.
Can’t Afford to Travel? How to Keep Your Family in High-Tech Touch includes info about videochatting using iChat or Skype, uploading photos to Flickr and blogging.