Ubuntu 13.04.10 is here.  Torrent is the preferred method for me.

Ubuntu 13.04
Torrent Links Direct Downloads
Ubuntu Desktop 13.04 64-Bit Torrent Main Server
Ubuntu Desktop 13.04 32-Bit Torrent Main Server
Ubuntu Server 13.04 64-Bit Torrent Main Server
Ubuntu Server 13.0432-Bit Torrent Main Server

Other releases.

http://releases.ubuntu.com/13.04/ (Ubuntu Desktop and Server)
http://cloud-images.ubuntu.com/releases/13.04/release/ (Ubuntu Cloud Server)
http://cdimage.ubuntu.com/netboot/13.04/ (Ubuntu Netboot)
http://cdimage.ubuntu.com/ubuntu-core/releases/13.04/release/ (Ubuntu Core)
http://cdimage.ubuntu.com/edubuntu/releases/13.04/release/ (Edubuntu DVD)
http://cdimage.ubuntu.com/kubuntu/releases/13.04/release/ (Kubuntu)
http://cdimage.ubuntu.com/lubuntu/releases/13.04/release/ (Lubuntu)
http://cdimage.ubuntu.com/ubuntustudio/releases/13.04/release/ (Ubuntu Studio)
http://cdimage.ubuntu.com/ubuntu-gnome/releases/13.04/release/ (Ubuntu-GNOME)
http://cdimage.ubuntu.com/ubuntukylin/releases/13.04/release/ (UbuntuKylin)
http://cdimage.ubuntu.com/xubuntu/releases/13.04/release/ (Xubuntu)

As always Have fun :)

Ubuntu Unleashed 2012 Edition: Covering 11.10 and 12.04 (7th Edition) (7th Edition)