I started the this last winter at 220. After 3 months off the bike and with no other exercize I started the riding season a few weeks ago at 225. I increased the bicycle-portion of my commute by over 100% and in three weeks have dropped about 7 and fluctuate between 217 and 220....for now.
As for a goal, if I can live to be 80 and ride without training wheels I'll be happy (regardless of my weight as long as it's the 260 it was before I started). So, no more cheeseburgers, smokes or half-racks of beer and I keep an eye in the rear view mirror to keep fenders from getting too close for comfort.