Kolaborate

For those of you who already do this, no need to read further. However, if you’re new and have a couple of domains just sitting in space then look into parking the domain and possibly earning from typed in traffic.

Sedo.com (my fav)
Namedrive.com (applied interest)

I’m always looking for new marketing options, but only comes with the business if your holding domains. While I have several hundred domains, the big guys have several to over 12K domains that must earn traffic revenue. Keep in mind that the more you own, the more you owe in annual fees. So, be creative when buying and promoting.