The Mulfinger - Nipple Loading Tool by Efficient Velo Tools
Want to lace up a wheel with a rim that has a deep aero section very quickly? This tool features a 2 degree tapered end sized in such a way as to allow for a “friction-fit” in the nipple and allows you to quickly load the nipple, start it on the spoke threads and break free in a snap! Available in 2.0mm (14ga) and 1.8mm (15ga) sizes. Once you use one of these you will never know how you lived without it (well, maybe you will, but it's pretty awesome).
Price: $19.95 (14g and 15g for sub-50mm rims)
$22.95 (14g Extra Long for deep dish rims)