With the popularity of flat design rising and with many (even myself) thinking that it will be the design trend of 2013, it doesn't just have to apply to UI design. Flat design can also apply to logos. The great thing about flat logos is that they can easily be transformed and used with many different colours. They can also work in nearly any environment due to their adaptability.
Also check out "Flat – The New Design Trend for 2013" post, it's one of the most popular posts on the site.