As Dan and others requested, here attached is a block we call "Attendance Site Data" or "attendance_csv_all". It's purpose is to collect all the Attendance module data from a whole site and put it into a single excel file (csv). We have 150 foreign language classes that use the Attendance module and it pulls the data we want (dates of absences) from all of them. The dates to pull are configurable as you can see in this screenshot. There are no docs so you just have to try it. I think only admins can see it on the front page of the site, but I am not sure.
We use it in Moodle 2.5. The data downloaded into the excel sheet will show the course name, course instructor, student names, and dates of the classes as indicated in your Attendance Module. Within the grid, the exact dates of absences will be printed. We look for absences because our staff will contact students will large numbers of absences from these required courses.
You may want different data, so you are welcome to re-program this block and I hope you re-post your new version code here on this forum. Sorry, I don't have time or knowledge to put this into the Plugins database. The last time I tried it took me a year and a half to get the Sharing Cart approved. If you want to post comments, feature requests or code to integrate, you can post it here but we only have funds to update it once a year.
Cheers and a big thanks to Dan for maintaining the Attendance module.