We had good success with a Burley trailer.
One point though, you probably won't be using a trailer before 2010. The child needs to be able to hold its head up with the weight of a helmet before its appropriate to put it in a trailer. So they need to be at least 6 months old. I've been told that in some states in the US this is a legal requirement.
We started our daughter out at 5 months, but in hindsight, we were probably pushing it.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.