Ok, thought I'd join in the fun here ...
Firstly, I'm with a few others on here ... I ride like a pansy in the wet. Carefully, and as smooth as possible, so that when I have to brake it's never (or as close to never as possible) ... an emergency, and therefore my chances of locking wheels are greatly reduced.
I've had a few slips n slides in the wet, and on diesel and it's the least fun thing you can do on a bike (well apart from coming off) IMO.
As for braking advice ... I've only been riding just over a year so I ain't really in any position to offer up any advice of my own ... just what I was taught by my riding school and what I've read on the subject.
During my DAS I was told no matter what the weather it should be front brake first, smooth but quick - progressively harder on the brake, but a split second after applying the front, to apply the rear in the same manner, but to a lesser extent ... in the wet, though, that should be an even lesser extent to the point at which you are almost not using any of the rear braking at all.
Now, from an article in Bike, by a very respectable ex-motorbike cop ... who basically says ...
You have 2 brakes so I don't hold with all this theory about hardly touching the rear in the wet ... 2 brakes are better than 1 so why not LEARN to use them both!?
He also said that you should find a stretch of road and practice ... and practice OFTEN, and in different weather/road conditions, so that when you HAVE to do it in an emergency it becomes like 2nd nature (muscle-memory).
And finally, how many of you have practiced emergency braking from the speeds that you NORMALLY ride at?
I found that last one a particularly sobering thought ... Last time I practised an emergency stop was shortly after my test and I was doing no more than 30mph ... and yet I regularly (not these days, someone shouts!) ride at NSL ... yet I have absolutely no idea what my stopping distance is on a bike from 70mph ... in ANY road conditions
so maybe I should get myself out there and start practising that on those ever-so-empty motorways
The whole article about braking was very interesting and included a little bit of math about if you learnt to apply the rear in different ratios to the front, how much extra braking that could give from say 50mph, and how much sooner that would stop you ... something like, progressive braking using both brakes (50:50, rather than say 60:40 in favour of front) from that speed might actually save you 20ft (something like that?!) ... which could be the difference between stopping short of that car in front, or going straight into the back of it ... don't quote me on those figures tho ... I'll have to see if I can dig out the article (I think it was last Octobers issue, but not sure about that either)