After glancing through the code (but not having installed it), I think this looks like a useful module. I'd consider using it as a method of gaining feedback from a class about a particular teaching unit (with students being able to vote to agree with other student's feedback).

A few things I wondered, I notice that you have disabled the ability to remove a vote already cast, would it be better to make that an option on the settings screen? Even better, would it be possible to also include (as an option) the ability to add 'down' votes? (I know that is a hotly-debated issue on sites such as Digg, but giving the Teacher the choice might be helpful).

I'm sure you've also considered other features, such as the ability to comment on other student's questions (possibly with the 'Teachers' response being highlighted or with comments themselves having the up/down vote option).

You could also add some features like Google Moderator, such as marking questions as 'answered' or showing a random question and asking students to vote it up or not.

Anyway, those are just some thoughts, overall it still looks like a great little module and I may well be chatting to our site admin about trying it out in college.

Is very usefull, but how we can delete the messages or the rounds. Is there any administrator capabillities?

Zhigang, have you developed this any further? I am looking at using it for one year to pilot it and I just wanted to ensure I grabbed the latest code. I notice you have been active in your Github 2 months ago - should I take that code or the plugin listed on moodle.org?? 

It looks awesome btw, simple yet functional with some nice subtle functionality, like sorting the questions automatically - nice touch. 

I have just recently taken over the job of maintaining the Hot Question add-on. My priority at the moment, is to get it updated so that it works with all the newer versions of Moodle. Be sure and let me know if you have any problems with the new versions I've released. I hope to have more available for Moodle 2.9 and 3.0, soon.

Just released a new version of Hot Question that works for both Moodle 2.9 and 3.0.