I'm using Spurt wax-based oil. Seems to be very good and the chain seems to remain cleaner for longer – it still picks up dirt but seems to be easier to wash off as well…
Bikemagic were running a competition for the stuff a couple of months ago, I was after some new luve and entered…didn't think much of it but got a sample through the door, tried it out and it seemed to work very well (previously was using Finish Line Wet Lube – which worked but did seem to need reapply after each slight damp ride) – this new stuff, gets applied once a fortnight and seems to last very well indeed.
It's my first use a wax-based lube and I'm immpressed with it – shifting is still crisp and the chain takes very little time to come up clean again after it gets a good drowning in muddy water. I doubt I'll go back to the Finish Line stuff as this works very well indeed (and from what I can tell I can get twice the amount of lube for the same price as the Finish Line stuff so theoretically it should last me longer as well).