The code is hosted at Gitorious. You can obtain your local copy by running following command:
$ git clone git://gitorious.org/trojita/trojita.git
Alternatively, if you don't feel like working with git, you can download this archive with the latest revision of the master branch.
If you prefer to work with something more official, you can try the latest release, 0.2.
Go to the directory created by Git (or unpacked from the archive) and run:
$ qmake ../trojita.pro
$ make -j4
After successful compilation, you can run Trojitá from the build directory:
$ ./src/Gui/trojita
If you encounter a bug in Trojitá, please report it to it's issue tracker.
Wishlist items belong to the same place.
Trojitá's IRC channel #trojita is hosted on Freenode network. The main author, jkt, is often to be found there.
There's a mailing list at trojita@lists.flaska.net. You can always contact the author by e-mail. However, issue tracker or the mailing list is the preferred way for reporting bugs and requesting features.