With an iPhone there are so many cool applications now. The best traffic one I’ve found is called Waze. Gives you free turn-by-turn navigation and nice UI (compared with GPS Drive which I used to use) and it has traffic, police and accident reports that are user generated.
But onto wine applications. What a pain to actually figure out what you have and catalog it. Mashable did a quick review and found Snooth Wine Pro that let’s you just take a photo of the label and then do automatic image recognition while Cor.kz Cellartracker does bar code scanning but doesn’t get good reviews and then there is Cor.kz which does get 4 out of 5 stars and gets decent reviews.