OSPF Vs EIGRP

["Patrick O'Keefe" <pokeefe () critical net>]

Dave do you know of any Global Corporations that are using EIGRP ?
IF so, what do they do when a major merger takes place and the corporation aquires a large amount of non Cisco routers 
throughout their newely aquired global network ?   I have also been trying to locate a case study of the percentage of 
global IP networks currently using OSPF Vs EIGRP and any recent trends towards one or the other ?