This site has a list of raw multitrack projects which can be freely downloaded for mixing practice purposes. All the files are presented as ZIP archives containing uncompressed WAV files (24-bit or 16-bit resolution and 44.1kHz sample rate), without any effects or processing.
With increasing numbers of producers, engineers and musicians making their initial foray into the world of surround sound, we also felt it was important to provide a primer of sorts — a summary of the current state of the art — as well as a description of current production practices, distribution formats, and encoding formats. Also included is a discussion of various relevant topics, including surround sound mastering considerations, sample rate conversion, downmixing, and upmixing.
This blog has a large collection of tutorials, tips and tricks, and other resources about electronic music production.
If engineers adopt a consistent set of practices for Pro Tools sessions that achieves commonality in labeling, file management and audio track maintenance, the digital workstation method of recording and mixing can realize substantial improvement in productivity. This paper presents suggested guidelines specifically to aide in improving the exchange of sessions between various recording facilities and/or engineers.