Despite the fact I pay a fair bit of attention to the rest of my bike, I'm a bit slack when it comes to maintaining my drivetrain. I do tend to pull may chain off every few months and degrease it but I've never been too fussy about what lube I put on the chain once it's time to go back on the bike. At least until recently.
I first came across Boeshield when a small bottle was included with a folding kayak we bought as a lubricant and anti-corrosive for the frame members. I heard good things about it an when I saw some online at Abbotsford Cycles I thought I'd give it a try. It comes in both an aerosol spray and a standard bottle, I prefer the latter.
In short: this is seriously good stuff. It's thinner than most chain lubes but really works its way into the chain links, seriously quietening the whole works. I've tried just about every way to lubricate a chain from paraffin wax to sewing machine oil and just about every specialist bicycle chain lube out there and this is the best I've come across by far, it makes a difference I can actually notice. There's a slight downside in that Boeshield T9 isn't as weather-resistant as claggier chain lubes and can sometimes need to be reapplied after 200km or so - although that's really only a matter of whacking some on your chain, waiting a couple of minutes and removing the excess. Highly recommended.