PDA syncs with watch
My PDA just beeped at me and I thought it was my watch. And then I thought, why doesn't my watch have my PDA's date book inside it? My watch is analog but it could contain my PDA's basic calendar functions inside it, even if I would have to go to the PDA or desktop interface to program it. If flash memory were really cheap and small, I could sync my PDA with my watch and it would remind me of things instead of (or in addition to) my PDA.