No you can't I'm afraid - don't try, maybe the pdaXrom will be ported to other architectures one day as they say on their website but at the moment its Zaurus only. The Jornada 720 was a nice machine and I'm sure Linux would run quite well but I don't know of any current projects I think the project that was going on has stopped but I know it got as far as running X AFAIK, there's a mix of people here, some may know more on this.
-Francis