more proof that panama is working. By Ben Charny Last Update: 12:16 PM ET Apr 10, 2007 SAN FRANCISCO (MarketWatch) -- Yahoo Inc. (YHOO : Yahoo! Inc News , chart , profile , more Last: 31.97+0.33+1.04% 12:21pm 04/10/2007 YHOO31.97, +0.33, +1.0%) says it has signed an exclusive, multi-year deal with to provide Internet search services and advertising on Viacom Inc.'s (VIA : viacom inc new cl a News , chart , profile , more than 100 Web sites. The deal represents one of the most significant business wins for Yahoo since it unveiled Project Panama, which is a technology upgrade designed to better match advertisements and Internet search results. Neither company revealed financial terms of the deal.