I mooved photoes from iPhoto '08 to aperture 2. I dragged them from iPhoto to folders on disktop. Then I simply imported them to aperture. The photoes then appear in two versions one named ex 'library-0046 ' and a similiar photo 'DSCN0076'. Which of them shall I keep? They seem to appear both as masters. I do not want to keep 2 copies if I don't need it.
I am an Aperture 3 user, and have not used version 2, but it seems you should use the standard Import from iPhoto function.
Have a look in your Aperture User Guide, and look in the Import menu function.
When you say you dragged to the "disktop" does this mean you used Finder to drag from the iPhoto package to the desktop? Opening up such packages is rarely a good idea.