On the Zend Developer Zone there's a new post from Ralph Schindler announcing this month's bug hunt days for the Zend Framework project - April 28th (today!), 29th and 30th.

Now that you're done paying the Tax Man (for the North Americans reading this blog post), it's time to pay it forward by helping an open source project close some issues! For those who haven't put the reoccurring event in their calendar, this announcement is for you. [...] For those of you unfamiliar with the event, each month, we organize the community to help reduce the number of open issues reported against the framework.

He mentions the top contributor of last month's bug hunt (Benoît Durand) and some handy links you can use to get involved - the current bug list, how to sign up for a CLA (required to contribute) and a guide for the beginners out there.