Android: AppESP is an Android Market enhancing application that analyses your current applications, what's popular in the Marketplace, and trending topics related to Android apps, to give you personalised app recommendations.
AppESP scans your existing roster of applications, searches for patterns (lots of games, a focus on productivity apps, a love of widgets), and then combines that data with popularity rankings on the Android Market and other app aggregating sites as well as app-related chatter and trending topics from the greater web. Based on all that input AppESP generates a list of recommended applications for you. You can hop into AppESP to check for new apps or turn on notification bar alerts to see real-time suggestions you can Like/Dislike to further hone the recommendation engine.
AppESP is free and works wherever Android does. You can download it by searching for AppESP on the Android Market or scanning the QR code to the right.