I'm currently developing Anki client for Harmattan, using Anki library, PySide and QML. It's in private GitHub repo yet, but if someone wish to join, feel free to contact me: https://github.com/divan
I haven't tried it on Maemo 5 yet, it surely will need some code changes, but should run smoothly. I'll update as soon as it will be in beta, and will open github repo for contributions.