MorphOS for Cyberstorm and Blizzard ppc cards cannot be registered anymore. The demo though is still available and fully functional except that 2 hours after each boot up it slows down dramatically.
If you get an A4000 w/ ppc card there are of course chances that it comes with a MorphOS key. Then the istallation of a 1.4.5 partition makes pretty sense. But generally the Cyberstorms are just too weak for today's demand. Your mentioning of the HTML5 support by OWB is right - but this requires some serious computing power.
Youtube for example needs something like a G3/600 to work reliable. To have the real fun a G4 ~1GHz is the kit you want to have. Luckily some of the matching hardware is pretty cheap (Powermac G4, eMac or Mac mini). But that hardware doesn't run OS3.x then....
Eventually a matter of taste.
If you want o read some more about MorphOS I can point you to
http://via.i-networx.de/mid.htm - I put a few documents about MorphOS on that page.
