For same rim/same hub rebuild, a Park Spoke Ruler is nice to have:

http://www.universalcycles.com/shopp...ls.php?id=3954

For the Fulcrum/Kinlin combo I'd probably just let the LBS pick out spokes. OTH if you have calipers you could measure hub specs and then plug in the rim's ERD (ERD: 587) to one of the spoke calculators out there. I've had good luck with Damon Rinard's spreadsheet I got off of Sheldon's site. There are online ones too, though.