Moodflow:
What I have been doing is rendering 36 individual 800 x 600 images. At an angle of 45, 15, -15, and -45 I render an image every 45 degrees. For 75 and -75 I render an image at 0 and 180 degrees.
Once they have finished rendering I stitch them together with Hugin, then take the final output and convert it with Panocube.