We have been using this one for the last 3 years.
http://www.chiefdelphi.com/media/papers/2490
In the "native" download it tracks hours as the metric. Our Varsity letter requirement is based on days attended of "Mandatory" meetings. I have added another sheet to the workbook, that calculates this data, based on the log data.
PM if you would like to have me send you my workbook. Right now it has all of this years data, and I would need to scrub the student names from the sheet, prior to sharing.
If your metric is hours though, right out of the box, the file above works great.