I've been using pretty much the same rocket design for trips to Kerbin's moons for a while now, but, especially with the extra science components for career mode, I finally got exasperated with its gangly instability.
This new rocket uses the same layout for most of its stages, but has a much shorter and broader lander. I wasn't convinced that the extra engines and reduced fuel capacity weren't a compromise too far, but Jebediah successfully took it to the Mun's Farside Crater and back.
I've been playing Kerbal Space Program's career mode since the version 0.24 update. My best achievement so far has been crash-landing a probe onto one of Duna's ice caps, where it sent back temperature and pressure readings for juicy science points.