I used to put mine in screen out, keyboard first (the groove in the back is for the camera). I don't think there's a specific way to put it in. But mine was such a tight fit that I had to stretch it out a little first.
The groove is actually for teh trackball. and there's not a slotted groove but there is a little hole for the trackball to sit in on th eother side...the new blackberry cases are made so you can face them in or face them out, totally up to you...personally i face mine in to protect the screen and the flap prtects the camera
For mine it's obvious how it's supposed to go, because there is a circle the size of the trackball area in the front, and a long line indented in the back for the camera and all. I place it with the keyboard going in first, and the screen facing out.
The new OEM holsters and pouches are designed so that they can go in screen in or screen out. If any of us remember the old blackberries they always slid into the holster one way, Screen in, so I would say most blackberry old skoolers are used to putting in that way
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