Advice about log system

[orion_rus]

Hello world, i need to analize my server log's to improve quality of site and numbers of users.
May be somebody can give me advice about good log system.
Also i will be glad to hear advice what exactly i shall analize in this logs?
Thanks in advance

[bill]

Here's a good list of log analysis software from our Library: Which Stats Package is right for you? [webmasterworld.com]