Everybody has valid points.

Clearly nothing will help unless you put in the training and miles as well.

But it's also true that rotating weight IS where you will see the most (if any difference), and your wheels are pretty heavy. So, you may see some benefit to a lighter stiffer climbing set. In the end new wheels likely won't drastically improve your times, but they may help a little bit, and, perhaps more importantly, they could change the feel of your bike (which could be very very good, or bad as well).

If it would ever stop snowing (grrrr) I'd let you know. I just switched from some Mavic Kysrium Equips (about the weight of your wheels) to some custom built wheels (king hubs, etc.) that, although I haven't weighed them, should be significantly lighter. The bigger difference for me though will be the nicer hubs and the straight gauge spokes (no more bladed spokes to blow me everywhere!).

Which is another point. Weight alone likely won't make a huge benefit, but if you are upgrading all around (less weight, better hubs, less rolling resistance, better ride qualities for your type riding (stiffer, smoother, etc. rims)) then there will be a difference if only in how your bike feels and handles.

For actual number comparison.

From 1755g to say a 1400g wheelset (not incredibly light, and not ridiculously expensive to obtain) saves you ~.75 lbs. (or 3/4 of a pound).

If you go to a true lightweight wheelset, say 1150g, you loose 1 1/3 pounds. Not HUGE, but definitely noticeable (but may or may not lead to a noticeable difference in time as has been mentioned).