One thing that I've done in wet coditions, and only in an area with a fire ring, is to take the top off of my MSR fuel bottle, and pour a little coleman/white gas on. Make sure to put the lid tightly back on the fuel bottle, and move it far from your intended fire spot.

Stand back and throw a vaseline cotton ball, or match. The fire ball can be pretty awesome, so I only reccomend this as a last resort. But, you can skip the tiny kindling, the small pieces and medium small will boil off the moisture and burn pretty well.

Again, I've only done this a few times over the years, as it is unsafe. Make sure you haven't spilled any on your clothing.
Not a brilliant method, but it beats freezing in cold rain/snow, when all else fails. The white gas is much more volatile, than charcoal lighter fluid so really be careful, and again, use extreme caution.

This method reminds me of the last thing you hear a Kentuckian say before he dies..."Hey Ya'll watch this"...O.K., I can say that, you cant...

J. (Kentuckian)