Software for analyzing IIS logs?
Solution 1:
I used http://www.weblogexpert.com/lite.htm. It is free and quite good. You install it on Windows like any other program and point it to folder with logs.
There are standard and pro versions which you have to pay for, but lite is also often sufficient.
There is no more lite version which was free at the time. "There is a free fully-functional 30-day trial version of WebLog Expert." Note that it is free only for 30 days.
Solution 2:
I used to run Awffull on a linux box to process all the logs from multiples IIS servers. It was very fast.