I was outside the classB veil. TIS-B tends to report traffic on the screen about 50 NM out from Minneapolis radar. I was on a common traffic advisory or local airport frequency. On one occassion I managed to talk to the other pilot as he & I reported a position and altitude that were about the same. On one occassion the near miss was a head on, in which with each aircraft trvelling about 150 MPH leaves only about 10 seconds to see and avoid. I didn't see the plane coming on but the TIS-B system alerted me to the position, altitude, and direction. so it allowed me to focus quickly in the right direction. I saw the plane and took immediate evasive action. I'm pretty sure he didn'r see me. Even the guy I was talking to on a 90 collision course didn't see me until I said look straight ahead and up a I had pulled up due to the TIS-B alert. I agree that I need to be continuously looking but it sure is nice to be alerted to planes I may miss. Thanks for all the comments. I was off line getting my IFR rating. Yea!