I found the same problems with handycard & JTutor. Supermemo is neat for several reasons. Data entry can be done through excel. Each card can have up to 7 categories (last night I worked on cranial nerves and on each I put number, name, fiber types, origin from brain, where it leaves the cranial cavity and where the cell bodies are located.
When you do drills, you tap each card right or wrong. The wrong ones are recycled, but the right ones go into a test file. The PDA quizes you a day or two later, and repeats cards based on frequency of correct responses. There's more to it, but I'm on my way to lecture.
In general, it really seems worthwhile. The drawback is the unregistered version is EXTREMELY limited. I had to shell out the $15 dollars before I could see what it could really do.
Unfortunately, no matter how good it is, data entry still takes forever.