The policy and research institutes included below are excellent places for finding well-researched information, often written by scholars but presented in accessible language. Complex ideas are distilled into understandable concepts without losing academic rigor. These are perfect resources for undergrads! Be aware that some policy institutes espouse certain biases. A quick search on Wikipedia will allow you to sort out where each stands on the issues.
Be sure to check out Find Policy, introduced in the box to the left. It allows you to search simultaneously multiple research and policy institutes.