How to upgrade the Debian package?
Here's the 1.0 -> 1.0.1 upgrade procedure:

$ ls
page-crunch_1.0-1_all.deb  page-crunch_1.0-1.dsc
page-crunch_1.0-1.diff.gz  page-crunch_1.0.orig.tar.gz

$ dpkg-source -x page-crunch_1.0-1.dsc
dpkg-source: extracting page-crunch in page-crunch-1.0
dpkg-source: unpacking page-crunch_1.0.orig.tar.gz
dpkg-source: applying ./page-crunch_1.0-1.diff.gz

$ cd page-crunch-1.0/

$ uscan
page-crunch: Newer version (1.0.1) available on remote site:
  http://dcobac.free.fr/tcl/page-crunch/page-crunch-1.0.1.tar.gz
  (local version is 1.0)
page-crunch: Successfully downloaded updated package page-crunch-1.0.1.tar.gz
    and symlinked page-crunch_1.0.1.orig.tar.gz to it

$ uupdate ../page-crunch-1.0.1.tar.gz
New Release will be 1.0.1-1.
-- Untarring the new sourcecode archive ../page-crunch-1.0.1.tar.gz
Success!  The diffs from version 1.0-1 worked fine.
Remember: Your current directory is the OLD sourcearchive!
Do a "cd ../page-crunch-1.0.1" to see the new package

$ cd ../page-crunch-1.0.1/

$ dch
# Edit the changelog entry

$ debuild
# [...]

$ sudo debi
# Test the installed package


Once your package is ready, you can follow the instructions at:
http://mentors.debian.net/cgi-bin/maintainer-intro
