A very feasible demand:
In Google Reader when I am reading items shared by any of my friend, there should be a button that would directly subscribe me to that blog, from which the post was shared.
Not that feasible, but desired by lazy people like me:
In mobile phones there should be a capability that in a contact’s information when I add his/her birthday/anniversary, on that person’s birthday/anniversary a message should go automatically to him/her saying “Happy Birthday XYZ! – Kunal”.
Downright stupid, but a must have:
I should be able to give “missed call” to everything. Keys, specs, remotes, wallets – everything! Searching for mobiles is so easy, searching for anything else is a pain…