Perhaps a short term indexed bond fund? Something with low turn over, and a shorter average bond maturity (less than 3 years). Just remember the more you chase yield, the more risk you're taking on. Also, with interest rates being so late, you'll get burned huge if interest rates go up (bond prices go up when interest rates go down).
I'd stick with CD's and perhaps lock in longer terms (60 mo) for money you absolutely need for emergencies.