Sign up for a pay per click service and check every single one of your domains. Then let the bottom line decide if your name is worth holding or not. If you don't want to sign up, then I can let you point it to my account and I will give you the stats. Basically, if one of my names generate revenue > 125% of the annual reg fee, then I keep it. In most cases, you need to watch a name for at least a month to know what its potential is. Although my focus is on domains for resale, getting some steady income from traffic domains is just fine. Around 5% of my portfolio are typos which I keep just for the revenue.