higher industry concentration has a lot to do with it as well...
With Palm, HP and Dell having established themselves so well in the PDA market, outsiders such as SHARP (or JVC who also pulled out) really stand no chance.
IMHO the Zaurus is a neat device though - it's a pitty current PDAs are OS-specific
/me wishes for the commoditisation of PDA hardware so one could use any OS he/she likes
currently only Compaq (and a few of the later HP) iPAQs has the option of either PPC/MS Windos Mobile or Linux (check out OPIE for Ipaq, it rocks!)
