ALIP is a minimal LXDE based desktop environment which might me useful to most allwinner users. In any case, you can get the actual rootfs tarballs here. Latest snapshots can be made from sources such as Ubuntu Build Service New snapshots can be generated on request. A retention policy of 30 days applies to Linaro rootfs on snapshot servers. Linaro offers a set of different root filesystems.
Depending on how the SD card is connected, the location to write data to can be different. This page describes how to create a bootable SD card.