I am looking at http://www.yiiframework.com/contribute/ and i don’t see a donate option and i really think there should be one (via paypal maybe since it’s the easier way).
I don’t know how much money would get via this option, but i do know that i make money using Yii and Yii dev team time, so i really think we should give something back (except reporting bugs, asking for features, etc).
This can only lead to make Yii better, either that the staff would be a bit more motivated or by paying for servers, etc. It doesn’t really matter as long as we have a way to show our appreciation for their work.
For Yii dev team, if you agree with this, please implement this in the main website.