Other GameEx related sites
GameEx ConfigHQ (Configuration and setup help, tutorials, game extras and more) here
Night's Theme Site here
GameEx French Forum and Site

Flash's Retro Computer Galery
This is an expanding archive of images covering Consoles, Handhelds, and Computers offering high resolution re-touched images for use in anything from advertising, web design, magazines - fanzines, and frontends. And also just for the curious. The web itself lacks images of classic historical gaming machines and this site (in due course) is here to put that right.
http://www.greatflash.co.uk

The Green Button, MoreMCE and XPMCE
Great Windows Media Center resources and forums
http://www.thegreenbutton.com
http://xpmce.com
http://moremce.com

MAME World
The no.1 and biggest MAME resource on the web.
I recommend you start here, for any MAME related questions or thoughts you may have.
I also recommend going here to download MAME or to find out where to download other MAME related files.
http://www.mameworld.net

LowRez Retroshirts
Fashion for Retrogamers: Quality-T-Shirts, Sweatshirts and more with cool retrogaming related motifs, printed in undestroyable flock or flexprint.
http://www.lowrez.de

MAME
http://mame.net

Non-Emulated games
The GameEx forum is a real melting pot for all things even remotely related to GameEx. Some of the members have compiled a great list of other non-emulated games that work well with arcade controls, game pads and GameEx.
See here

Related applications by Tom Speirs, GameEx developer.
MAME Screensaver
TS Gamelauncher tools
Windows MNG Player
Instant Sheller
DesktopMAME
Spesoft Free CD Ripper
Spesoft ShoutOff
MCEJoy