After spending a couple of decades in marketing you start to realize that learning is a lifetime pursuit. What you know today will quickly be superseded by new information, tactics, and tools. While paid search advertising has been around for almost twenty years, it continues to evolve. Here is a list of sites that I use to keep up-to-speed on the latest developments across paid search advertising. These sites regularly post great content about paid search whether it’s commentary on the latest AdWords update, an interesting take on a new bidding strategy, or fresh data from industry reports.