Wine is a very interesting hobby and there are so many different types of wine out there. One of the things I like to do is really taste the wine. Take some notes. Compare. I also have a terrible memory so writing things down is a good way to go.
That is why I got a wine tasting book, designed for taking notes about wine. Moleskine has a wonderful one, that is the one I got. You can buy them here.
Below are some examples of things to note when writing about a wine.
Available at Vinmonopolet: