The images below should match the devices’ relative size.
Update #1: Last week I posted a comparison chart for FIC’s Neo 1973 and Apple’s iPhone. I removed the chart, because there is now a semi-official one at OpenMoko’s GoWiki.
Update #2: Here’s a video showing a prototype of the Neo 1973 (however, not enabled).
Update #3: Added Nokia’s N800. I’ll add a comparison chart later.