If you've already heard about Scott's Cheap Flights then you know about their concept. There is no longer needed of you to spend hours scouring the internet for those incredibly discounted flights, just simply let "Scott" (the service) spend 24-hour a day 7-days a week doing the searching for you.
By using this service you'll save a lot of time and "Scott" will also cover a lot more ground than you would ever be able to do on your own. The only downside to the service is that the free version is somewhat limited.
In this version you are only able to choose rather large areas of departure (e.g. Northern Europe), something that isn't very helpful most of the time. However, if you decide to pay for a premium account at about 2.5€ a month, you'll get access to your own account page where you can specify exactly what airports that you want to depart from.
I have only been using this service for a short amount of time, but the deals that I've received this far are incredible. We're talking trips costing under half of what they would normally do, and if you're still unsure about using this service I'd urge you to check out some of the testimonials at their success stories page.
To end this post I'd like to say that this is not a sponsored review, I just really enjoy this service, and it's nothing wrong with trying out their free notifications. Just remember, deciding to go for their premium membership will probably end up paying for itself if you go for one of the deals (what you save on one deal will on average cover the premium cost for about 10 years).