Hard Graft Phone Fold Wallet - $98
Pricey for a case, but I need a new wallet anyways. Two Birds!
Looking at the construction though, I feel I could easily make one of these. If only I had access to an industrial sewing machine! My cheapo target one wont puncture leather that thick.
Etymotic MC3 - $90
Cheap(ish), durable, and supposedly they sound absolutely amazing. My last pair of Shures didnt last long, so I figure I ought to try out some other brands. I hear they have some issues with the 4S though.
Morphie Juice Pack - $35
Iphone 4s seems to have battery issues. This little quick charger might help mitigate those issues.
Lifeproof Iphone 4 case - $80
Slimmest waterproof (up to 2m), shockproof (up to 2m), dustproof, adding only 1/16" thickness.