JONO_DALE  This is a great piece of software that plugs a very serious hole in iCal where it can silently send invitations to people without your knowledge, especially for recurring events which have events in the past. When I upgraded to Snow Leopard, I noticed that a number of people were being flooded with iCal event changes when I made a change to a current event which had recurrences in the past (for some reason, iCal was retroactively updating the previous events and generating multiple invitations for these past events!).

iCal Reply Checker is a great way to stop this kind of nonsense, as well as giving more fine-grained control over how iCal can send invitations.

The only thing I think the developer should add (which would get 5 stars, IMHO) is to summarise the information where there are multiple invitations for a single event. For example, I have an event with 40+ participants and when I make a change with the preferences set to 'Do not send emails' and 'Display Notification', I have to dismiss 40+ dialogs. At the moment, I have 'Display Notification' unchecked so they are being silently discarded, but it would be nice to see when iCal is trying to send invitations in this situation.  
(Version 1.3.1)

JONO  Version 3.0b4 causes all kinds of trouble when an OpenVPN session is connected and then the Internet connection is unexpectedly broken (for example, unplugging an Ethernet cable to closing the lid). Almost every time, it removes my user name from the password file and I am forced to reboot.  
(Version 3.0b4)

JONO  A very full-featured IM client. However, Group Chat support still needs some work; there is no way to auto-join Group Chat rooms when a connection is made. This makes things tedious (Colloquy has a neat way of doing this)  
(Version 1.0.2)

JONO  I like this game, yet the constant re-spawning of the enemies when you re-cross levels is boring and tedious.

Other than that, great fun.  
(Version 1.0)