If you ever had to deal with exporting data different from the data you display, you probably visited this blog posting:
which shows how that can be done. The purpose of the post is a bit different - it shows how to adjust the format of the exported file. Just recently I had a requirement to display some reports created using analytic functions with some groupings and counts. At the same time, there was a requirement to export the data without the results of the analytics. I could have used Scott's posting but I was too lazy. Instead of that I used the following (simple) approach. Basically, you would create two reports - on in which you display your data and one (never displayed) for exporting. The only thing you need to do then is to modify the link label.