GIGAOM — As we saw with the death of Michael Jackson and the Iranian election protests, statistics on tweets help to reveal how information spreads across the web. For many, Trendrr has emerged as the digital tracking service of choice, lauded for its both its ability to procure stats and charts on Twitter trends and for its easy-to-use user interface. But while some may find Trendrr’s UI intuitive, compared with a lesser-known rival, Buenos Aires-based Trendistic, I’ve found it hard to navigate. And it can require far more clicks to get to the same stats. Flaptor’s Trendistic, formerly known as Twist, tracks and charts the percentage of tweets that mention a certain search term over time...

Let's say you want to track how something you are working on is doing. You can look at it's web traffic on comScore, Compete, Quantcast, Alexa, etc. You can check out how it is doing on Google Trends. But if you want to do something a bit more sophisticated, you might want to try Trendrr. Trendrr is a free service (for a limited amount of data tracking) that let's you track keywords across multiple data sets. Here's a screen shot of the basic service which shows how it works...