Room40 has recently released a 3" CD single from San Francisco based drone-ist Christopher Willits titled Plants and Hearts. It's a single track of 21 minutes and 30 seconds of droning guitars and etc. Really nice stuff and great value as an eMusic download, if you're the kind of person who uses eMusic.
From the Room40 site:
Incorporating 4hz isochronic pulses and panning at the same frequency, this work encourages the formation of 4hz brainwave patterns associated with states of meditation, deep relaxation, enhanced creativity, light sleep and lucid dreaming.
Science! I don't know about any of that, but I'm listening to it while writing this blog post and I feel pretty ok.