Getting Kaffeine

Current unstable version: 1.0-pre2
Requirements:

QT 4.4, KDE 4.2, xine-lib and libX11

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Source

kaffeine-1.0-pre3.tar.gz
kaffeine-0.8.8.tar.bz2
kaffeine-mozilla-0.2.tar.bz2
(Starter-Plugin for Mozilla)

Ubuntu/Kubuntu

apt-get install kaffeine
You can also use: adept-installer

SuSE

http://packman.links2linux.de/package/kaffeine
The xine library provided by Suse has a lot of plugins missing because of software patents (for example, all mpeg related plugins). It's recommended to install a "full" xine library that can be found at http://packman.links2linux.de, too.
Nightly Builds (for testing!)
Or add to YaST Download-Sources:
Type: FTP
Server: packman.iu-bremen.de
Directory: suse/[version]/ (e.g.: suse/9.2/)
Provided by Manfred Tremmel

Mandriva

kaffeine-0.8.8 for Mandriva 2009.1: i586 and x86_64 architecture
kaffeine-1.0-pre for Mandriva 2009.1: i586 and x86_64 architecture
Provided by Oliver Burger