Editing PDFs in Linux

Evince is my document viewer of choice these days because it supports PDF, PostScript, DVI and DejaVu files. But it doesn't support annotating documents. So far, I have found the following programs for editing PDF files.

flpsed is a PostScript annotator. So convert PDF files to PostScript using pdftops and use flpsed.

Scribus is an open-source application for "professional page layout". This means that it is overkill for a PDF viewer if you only annotate occasionally. Hmm. It seems that you have to convert to PostScript here as well (then File -> Import -> Import PS).

These programs can be installed with apt-get.

apt-get install evince
apt-get install scribus
apt-get install flpsed

I wonder how hard it would be to merge flpsed and evince.