We’ve been using Squirt on most of our bikes for the last couple of years.
It was only when I had to fix a puncture on my commuter bike this week that I was reminded how filthy conventional chain lubes are.
Fantastic in dry conditions, it also lasts well enough for long wet rides. The only real disadvantage is that you really need to apply the night before a ride (or at the end of the ride before) to let it set properly.
Available from In2Dust