I've spent the past few weeks working on a decent-sized project called ZMonitor to help at my current job. It is basically a client I developed in Ruby to show the Zabbix dashboard in a terminal, since there wasn't one available previously (other than this perl+curl mashup my workplace was using).
The main application basically calls the API twice through JSON calls to gather all of the information it needs, and then generates an array of strings and prints them at the end. There is an option to hide events that are in maintenance mode, which can help a lot from spamming you with an unusable list.
The acknowledgement function can accept most regular expressions to allow for mass acknowledgement (however, no wildcards since those can be abused too easily).
There are several TODOs for this application already, too, that I might not get to complete anytime soon. The major one is to use ncurses for rendering the dashboard, and quite a bit of functionality will come with that (such as acknowledging from the dashboard, and maybe interactive filtering). Additional functions for showing the history of a server is also planned, and a calibration function to determine time differences between the local computer and Zabbix master.
1.0.9.pre is for the most part very usable now. I personally think some of the code is a bit ugly since I'm not superb at Ruby yet, so all input is welcome. The whole application is also pretty colourful, don't you think?