4 lb tub of DampRid Moisture Absorber by DampRid. Some people use DampRid to help control kegerator condensation.
Update: Since this post was published the price, availability or promotion has changed. Check the product page for current description, price and availability. Also: Today’s Deals on Amazon
DampRid FG50T Hi-Capacity Moisture Absorber, 4-Pound Tub
Also Consider: The Eva-dry E-500 Renewable Wireless Mini Dehumidifer. I’ve used this for years in my kegerator and it works very well at keeping condensation in check… Hands on Review
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