Distributed processing has become inevitable in many areas today. It can be found in localized systems like multiprocessor computers, in client-server network configurations, in computer clusters or in widely dispersed systems like the Internet. Development of effective techniques for task distribution is considered as one of the biggest issues in parallel and distributed operating environment. Over the past years, a number of load balancing methods has been proposed. This paper describes simulation used for methods comparison. Contrary to the vast of known methods, which are based on client/server technology, a few recent methods are based on mobile agents. This article gives short review of achievements in this area and describes simulation used for agents based load balancing methods comparison. The paper also suggests enhancement in load balancing: mobile agents could include fresh node into the system by installing and starting necessary software components.