I haven't, but plenty of people have been using the Gigabyte and Asus G33 chipset boards with good overclocking success. IIRC the Gigabyte is a bit more popular. They have three boards which all clock around the same, differing just in options. For instance, all boards use solid capacitors for the CPU power, but the most expensive ones have them all around (perhaps not necessary). Also the middle one is geared more for HTPC with HDMI output using the onboard video, plus eSATA. I'd think the cheapest one is good for most people.
Look for the Anandtech G33 chipset motherboard roundup in two days, on 9/26 (unless delayed again).
If you're not in a super hurry for it, then Nvidia's releasing their new IGP chipsets for Intel really soon, which may bring more options.