Effective Mac - Growl back to work

Stumbled over James's blog entry about useful software for the Mac and added Growl to my list of software that you need have/use to be effective, but was not able to make it work with X-Chat (AquaChat). Confronted with the option to figure out what is wrong or to try something new, I took the easy way out: I tried Colloquy. This worked out of the box. I know need to find out how to make my Twitter tweeds show up in Growl.