Reports - Lock Column Headings
Would be helpful if column headings locked so you could see them as you scroll down the report, like you can in Excel.
Meg Hillmann commented
Piggybacking on this idea, I'd love to see the ability to rotate column headers so that you can make columns thinner and see more of them on the screen (e.g. column headers from screenshot here: http://prntscr.com/r1a7z6).