Oh my. This definitely explains the sense of loss, emptiness, and continually growing need I always feel when I loan a friend my Handspring.

Speaking of which, how exactly does the Visor fit into this equation?

Well, since it's bulkier than the normal Palm, it is possible that the alien larva inside could be much more intelligent and capable of holding much more personal information than the other 2-meg Palms, due to the added capacity of the Springboard. The transparent/translucent case could also be an attempt to waylay fears:

"Look, Mommie! No alien larva inside this Handspring!"
"I don't know, honey... It still looks dangerous..."
"Pleease! Prettyprettypretty please!"
"All right..." grumbles as she pulls out her AmEx..