Twitter implemented a new authentication for 3rd party apps. Peep on HTC is no longer working. All devices running HTC sense with peep are effected. I installed tweetcaster and it works great.
Same here. According to AC, Twitter said everything was back to normal. Maybe they meant the site was back up, because I still get a bad username/password error.
For the record, before I updated my Incredible to Froyo, I was still synced with Twitter.