Running swap on flash of course kills the flash memory at some point. Just a word of caution.

But having said that, I have always wondered why nobody has enabled the near 500MB extra mtd block device that is unused on the Harmattan devices. ;-)

I give this as a hint: /etc/init/enable-swap.conf (with couple changes (remember to resign hashlist or you malf your device) you can gain 256MB more free ram (when disabling ramz) and gain almost 500MB swap). And it doesn't mess your mass storage size.