Here are some links to various  Amiga related websites:

Retailers:

Amigakit UK and Worldwide suppliers of the X5000
Amiga Shop Germany
Amigastore.eu
Amedia Computer
Amiga on the Lake US retailer

Websites:

Hyperion Entertainment
AmigaOS webpage
A-eon manufacturers of the X5000

Magazines

Amiga Future the bi monthly Amiga magazine in English and German

Games:

Huno PPC ports to Amiga OS4.1

Amigasoft.net

Aminet Software repository

OS4depot- Software repository, games, drivers and other pieces of software for Amiga OS4

Entwickler X makers of some cool OS4 games and software

Forums:

Amigaworld
Amiga.org
Amigans
English Amiga Board