I finally gritted my teeth and finished the second thumb.
This is based loosely on Pattern #11 from Mostly Mittens by Charlene Schurch. I had to rewrite the pattern because my yarn was much thicker than the one called for in the pattern. (I will not do this again. What a pain in the #$%)
Yarn: Cascade 220
Needles: Size 3 wooden (I used the "two circulars" technique)
Time to complete: almost nine months. I got most of the way through one mitten in July 2010, then decided I didn't like the top section, and put it away. I then ripped it out, redid it, and then finished the second mitten all in the past month.