We mentioned this 3 months and 15 days ago, and here it is. A fully functional Linux client for WhatPulse!
The client has the basic features you'd want, and there will be updates along the line to get it up to speed with the features of the other clients.
It has been tested on several Linux distros and found to be capable of running on the latest mainstream ones.
There are two binaries for your downloading pleasure, a dynamic and a static (Qt) linked one. You will need at least Qt 4.5.0 (http://www.qtsoftware.com/downloads) to be able to run the dynamic linked one.
To organize things a little better I have set up a redmine tracker for reporting bugs/feature requests.