This thread and all the followups are hilarious, if it weren't such a serious problem. OP, you may want to add a bit more information on how this drippy screen problem occurs: where do you live, what are the weather conditions, what are you doing with the Mac when it occurs, etc.
Yes, extreme moisture, to the extent of causing visible condensation, is Very Bad News for any electronic device, and more so with one that isn't tropicalized like the Mac. Besides trying to avoid subjecting it to such extreme temperature changes, using some kind of desiccant to absorb close range moisture and avoidint its use until it dried out, I can suggest placing some kind of absorbent material between the display and the keyboard to prevent the moisture on the glass from finding its way into the computer. Like the protective poliethylene foam protector that came with the Mac when new. Or something like RadTech's ScreenSavrz: http://www.radtech.us/Products/NotebookScreenSavrz.aspx