When I open a new tab, I should be able to press the "Back" button like I do on my Torch to close the new tab and return to my original tab. This process works so perfectly on OS6, but it's tiresome on the PlayBook to have to open up the tabs, find the tab you want to close, and close it (all while dealing with a minor glitch that makes closing the last of many tabs troublesome at times).
In time I know most of what we love about our BB phones will find their ways to the PlayBook, but I fear this feature could get overlooked.