LaLatty - it begins when you want to begin. Pick a date and get stampin'!
Some folks started in May, but I waited until June 1. This weekend I plan on stamping a nice stack of cards to hold me for a few days. The goal is to use your stash, not buy new in order to complete 100 cards in 100 days. They can be dupliaces, swaps, cards for troops, cards to sell, cards to keep, whatever. I also plan to do a couple of scrapbook pags in place of cards as I progress.