We told you earlier this month that BlackBerry started adding a basic recommendation engine to the BlackBerry World website. They essentially have a box that now shows you what others also downloaded. I am glad to report that while going through BlackBerry World on my Q10 (running the latest 10.1 leak) yesterday I spotted something similar showing up in certain apps. BlackBerry is offering up 8 apps that users also downloaded. Sadly this is not available for all apps but it seems to be picking up.
Hopefully they also add the ability to see similar apps shortly based on popularity and common search terms/tags.