With the increasing need for networked applications and distributed resource sharing, there is a strong incentive for an open large-scale service infrastructure operating over multidomain and multi-technology networks. Service discovery, as an essential support function of such an infrastructure, is a crucial current research challenge. Although a few survey papers have been published on this subject, our contribution focuses on comparing and analyzing key discovery approaches in the context of large-scale and multidomain networks. The comparison is conducted based on a set of well-defined criteria, leading to a selection of few approaches that can serve as the guide in designing a global service discovery system for large-scale and multi-technology networks.