Colette van Haaren gave a workshop on Möbius cast-on methods and sent the following links for follow up infomation. The comments in brackets are from Colette.
Cat Bhordi has written books on Möbius knitting – her provisional cast on is a figure-of-eight wrapped over and under the cable of the circular needle. You can learn an invisible figure-of-eight cast on on Eunny Jang’s website: www.eunnyjang.com/knit/2006/03/majoring_in_lace_part_iv.html