Woo-hoo!
The little recessed line didn't work for me because...well...I'm a nail-biter. Nothing to grip with. I think I used tweezers, once.
So the tape is pretty much permanent on my SmartMedia cards. Seems like the tape "tab" breaks off maybe once or twice a year and I have to reapply. But it works well enough for me.
Enjoy your eBookwise!