SPAM SPAM SPAM today...

If you need to parse IIS logs, I can recommend Weblog Expert Lite for a quick fix. When your boss's boss's boss says, "How many Netscape 4.x users do we have hitting site X?", it's certainly useful. Creates neat little graphics and web pages with browser type, OS type, referring page, hits per day, visitors per day, etc.

It's a Windows app, and had the bonus of being the first freeware app off of a Google for site stat apps that installed without a hitch on my Windows 2000 box. I don't even know how accurate it is yet (missed the OS and browser for calls to our servlet engine and just labelled them "Other" without a warning, for instance), but it did the job we needed awfully quickly.

Ah, one last hint. On Windows, go to "C:\WINNT\system32\LogFiles\W3SVC1" (or wherever you store your IIS logs) and type...
copy *.log allLogs.txt
... at the command prompt to quickly concatenate your IIS logs.