chewing up apache logs

Greetings, I've just changed ISPs, and my old ISP used webalizer to report usuage/everything else stats about a website. The new ISP offers a simular product for a cost, but it looks very clumsy and bloated. I've been looking around for something I can use (preferably in PHP) which I can run once a month to crunch the log file I have available into a set of readable figures and stats. Everything I've found on the web seems to be really bloated, or runs in realtime with a MySQL back-end... I don't need this, nor do I want to slow down the site... I just want to run a monthly log file through a program, and spit out some meaningfull numbers. Has anyone attempted this? Is there something available already? Any tips on writing my own? Thanks Justin French