If you want to stay married, I strongly suggest Michele's book and the last resort technique. It's most likely your only chance for saving the marriage.
There are something like 200 pages in the book, and only around 5 of them are related to the "last resort technique". Read the rest of them!
My current status: june 2006. Wife ran out and filed D. Finalized Jan 11, 2010, after 12.5 years M. 3 wonderful sons caught in the middle