Oh wow. If you haven't watched The Spirit of Kerbin video series lately, do so. Just watched episode 7. Holy crap. http://www.youtube.com/user/MaceyDean?feature=watch
I'm still waiting for that series to continue... It's been a very long while since 0.21 came out...
Edit: Been playing around with that Spherical Tank Pack and the Kethane pack.
Ladies, Gentlemen and Assorted Transvestites, I present to you: The Munar Kethane Finder
First, the lift-off stage

After the liquid fuel boosters run out they are dumped and the Orbital Stage comes into play. It launches the Kethane Finder into orbit and on a Munar trajectory. The Orbital Stage can also be used to adjust the Munar orbit.

The Munar Orbit Polarizer stage (shown here while testing on Kerbin (read as: i messed up and forgot to add the solar panels)

I have to say, I fell in love with the Skipper engine during the building of this. It's not quite as strong as the Mainsail, but it provides better fuel efficiency and does not overheat and explode. Not too often, at least.