In the past, synergy involved legally binding arrangements, but today, things are much different. Thanks to the internet, there are many new opportunities for partnerships that all come with their own inherent risks.
So how do you enter into a Marketing Synergy that is stable and lower in risk? Simple, research, research, research... Find a partner with simular interests, look into their past accomplishments, see how active they are in your current speciality, and compare their success with that of your own. Doing your due diligence to match all your skill sets will bring you the most compatibility with your new partner.
And how do you find such a partner? That's simple too, just spend a few minutes online searching using industry specific keywords. Looking for those that have built a strong online reputation will be your best bet.
While a partner isn't the right thing for everyone, it can be a great way to help your business grow and put more profits in your pockets.