Sky+
When there's something I really want to watch and I remember about it 5 minutes before it starts and i'm out somewhere - just go onto the Sky+ app and tell it I want to record. Ta-dah, it's recorded and waiting when I get home
Ebay
Pretty obvious, but again, its nice to get text message style alerts if you've been outbid on something, especially if you're not near a computer all day every day.
Group Text
As the iPhone finds it hard to believe you might want to send the same text to a large group of people
Sickipedia
Everyone needs to be able to tell a current affairs joke just that little bit too soon