I thought I'd install the qtopia-memoryapplet.10.1_arm.ipk and when I closed the installation window for the final time I saw a message flash on to the screen briefly then nothing. The installation appeared to have locked up the Zaurus.
I couldn't close the installation window, the main menu wouldn't pop up - nothing would work and it wouldn't even switch off.
I took off the battery cover, pressed the reset button and it booted up. I thought I'd uninstall qtopia-memoryapplet to be on the safe side and it locked up again.