evolving, and in order for your site to get and maintain good rankings around the keywords that are important to you, you have to keep someone on the job on a regular basis who knows how to react to the changes happening. The Return On Investment (ROI) for good SEO/SEM services is very high, compared to traditional advertising and marketing. According to Google's statistics, Search advertising is up to 20 times CHEAPER per lead, compared to (for example) Direct Mail. For any company spending money on advertising, this statistic should be of EXTREME interest! After all, what company doesn't want to reduce their cost of customer acquisition? That's what SEO/SEM companies are supposed to be about! Well, at least at our company, we are - I can't speak for our competitors. Before you hire an SEO/SEM company, ask what their plan is for the ongoing optimisation of your site. If they don't have a plan, run, don't walk, to the nearest exit and hang onto your money.