Kid friendly fix for out of memory errors in Froyo My god-daughter has inherited her mother's old HTC-Desire, it's currently running Froyo, but despite having a huge memory card it still suffers constant out of memory errors. 

I can move things on to the memory card, but being 12 the god-daughter in question just gets confused and deletes stuff. 

Is there any kid-friendly permanent solution to the problem or an upgrade route to gingerbread.
From the commentary, it appears that you are having install problems, that is, out of internal storage, NOT RAM problems. 

Assuming that's so, then NO, there isn't any real fix - you can't increase the internal storage of the device, you can only add a bigger SD card (external storage) and move apps to it. 

The best you can do is to borrow the device regularly and push apps off to the SD card before things start to go wrong.