It's important to understand the difference between the Roth and Traditional IRA, and to understand deductible versus non-deductible contributions within the IRA account.  It can be a confusing topic and generates a lot of questions to our site especially during tax time.   We've added tools on our site that help determine which IRA is appropriate for you.  

Looks like Fidelity just introduced a tool on their web site.  Four simple questions to help guide your IRA decision.

Also, check out the January 30 posting- Vanguard podcast on IRA differences.