To get the app running you will need to install QT on your device first (download Qt v4.6.2 for Symbian from here), before grabbing the Symbian version. These are two regular SIS files which you install in the normal way. The .deb file for Maemo is also online, and again follows the regular route for installing on your Maemo device.
We’ll be taking a close look at this client over the next few weeks to see how it stands up to blogging while on the move, but after installing it, it certainly looks the part.