Oh...just noticed that "busybox" and "ash" is written at the top every time the terminal is opened....

Thanks for the link to the bug report. I never considered before that this is a bug, so I googled the issue and found another thread in this forum that solved my problems! (http://talk.maemo.org/showthread.php?t=37178)

Short version: The history was not saved because I always hit the "X" when closing it instead of using Ctrl+D. If you execute the history is also saved even when hitting "X".