Approximately 100k iPhone users, and what I'd guess as about 5-7% of all iPhone users, browsed to jailbreakme.com to put apps back on their 1.1.1 iPhones. That's not far from the 9% owner base that Apple brags picked up 2 million Leopard copies over the first two days of sales. That's a lot of iPhone hacking. [iPhone Atlas via Crave's Krazit]
If they're anything like me, they jailbreaked it, surfed the apps, and realized you can't reorder your icons, some of the apps aren't there/don't work as well as they did, and the themes are wonky. If so, they promptly restored their phones to Apple-approved lock-down.