i sail in the winter here on LongIsland ny. after a lot of trying different gloves we found the best gloves are $4.00 PVC gloves with thin glove liners. this gloves give you great grip on your sheets and tiller.
http://www.seattlemarine.net/productcart/pc/viewPrd.asp?idproduct=1792&idcategory=982.
the only problem is water can get into the gloves.
you can see my friend wearing this gloves in blue in this video
http://www.youtube.com/watch?v=-5umQeB07vEwe have our gloves sealed to the drysuit so no water can get in
if you are interested to seal the cloves to your drysuit i have a $15 way that work well
bernd