Whilst in NYC this summer i managed to pick up "It's a 10!", a "miracle leave-in product" which claims to do 10 things. Now, i'm not sure if it really does do all 10 but i do know that it leaves my hair very happy.
I use this as a hair detangler and frizz tamer. I apply around 5 squirts to my palms and work through my hair after towel drying it. It has some heat defence properties but i tend to use my tresemme heat protectant (buy here) alongside it for safe measure.
I've spotted a noticeable difference in the quality of my hair since using this. My hair has become more silky, smooth, less tangled and stronger. The product is very lightly scented with a fresh smell.
I highly recommend this product but it's not easy to come across in the UK, US readers can pick it up in duane reade. Alternatively you can pick it up online, "It's a 10!" retails for £20 on Ebay buy (here).