As part of their continuing promise to "take cheating seriously" and wipe out the "disruptive minority" on their servers, DICE has implemented a new system that allows players to report cheaters directly from Battlelog. If you suspect that you've been the victim of cheating or have witnessed some unfair chicanery, you can browse over to the offending player's Battlelog profile page and click the warning triangle in the top right hand corner. From there, you'll be presented with a dialogue screen that allows you to specifically catalogue the "unfair methods" and kick off an investigation. Several hundred cheaters have already been banned and stat-wiped thanks to player reports, and this new system should speed things up immensely.
Full details at the Battlefield blog.