PCB Manufacturers
They can produce the PCBs that you designed with Fritzing. These are some manufacturers known to work well with the designers or DIY community. They provide helpful services and have low prices on low quantities. However, PCB manufacturers usually do not assemble your boards!
Aisler
The official PCB manufacturing service for Fritzing
PCB-POOL
Low-cost, good quality and service (Germany)
OSH Park
Good offer for hobbyists (USA)
Advanced Circuits
Large company specialised in prototyping (USA)
OLIMEX
(Bulgaria)
Futurlec
(USA, Australia, UK, Thailand)
Fusion PCB
(China)
See also the listing of suppliers at OpenCircuits.
PCB Assemblers
Anyone have a recommendation? Otherwise just learn how to solder.
Electronic Parts Suppliers
The main international suppliers with extensive catalogues are Bürklin, Conrad, Digi-Key, Farnell, Futurlec, Jismal, Mouser, and RS
See also the listings at Arduino Playground, OpenCircuits, or try out the meta-catalogue search engine Octopart.
PCB DIY Tools
Tools, machines and stuff to make boards by yourself.
Conrad, Reichelt
.. sell basic equipment for etching PCBs
Techsoft
Low-cost PCB milling/cutting machines
Bungard
LPKF
Machines for high-end PCB production and assembly
Resources at FH Potsdam
Related pointers when you are studying in Potsdam
FHP PCB Lab
For making the PCB yourself