Earlier this year we highlighted the speedy peer-to-peer file sharing at iSendr. Since then they've updated to support batch files for multiple file transfer and QR codes for file transfer to Android phones.
Since our last look at iSendr they've added in bulk file transfer as well as QR codes for file uploading to Android phones (iPhones also support QR codes, but the iSendr transfer app is flash-based which rules out iOS products). You can skip zipping up your files before starting the transfer, just highlight them all, and share the link or QR code with as many friends as you want. Just like the original iSendr, all the files are hosted on your local machine, iSendr simply facilitates the transfer between your computer and the remote peer.
iSendr is a free service and requires no registration or login.