For the curious, below is the list of sites that DON'T send passwords in the clear.
The curious case was Zynga. They don't have a login form. (!)
Facebook, YouTube, Yahoo, Windows Live, Blogger, Baidu, MSN, QQ.com, Google, Twitter, MySpace, Amazon, Wordpress.com, Ebay, Rapidshare, yandex.ru, mail.ru, imeem, Flickr, IMDB, Craigslist, LinkedIn, AOL, Blogspot, deviantArt, PayPal, Alibaba, Ning, Hulu