These are some of the modelling related sites I visit often...

General Modellling Sites:

Armorarma - Despite its name, its a general modelling site

CyberModeller - Updated regularly for military modelling

Internet Modeler - Monthly Internet magazine on military modeling

Luftwaffe in Scale - despite its name, features not just aircrafts, from Austria (in German/Engllish)

Modeling Madness - general scale modeling site with good review archives

Modeler Site - monthly magazine format site in Italian/English

Swanny's Models - a great site of scale aircraft with reviews and modelling tips. Author have had articles published in FineScale Modeler Magazine.

Wingnut Models - Marc, NJIMPS & FSM forum member's personal site

Aircraft Modellling Sites:

Aircraft Resource Center - Scale aircraft site, good technique section

Hyperscale - An Australian site - pretty much one of the best known modelling site for the english speaking world.

J-aircraft.com - Everything with Japanese Aircraft modeling

Lams Modelling Site - Chinese aircraft modelling

Early Chinese Aircraft - same author as above, hard to find history of early Chinese airforce and aircraft (Traditional Chinese only)

ModelNerd's ModelShack - Mark Buchler's personal site with details regarding casting your own resin parts.

Russian Aircraft Modeling - dedicated to Russian military aircrafts

Scale Model Aircraft Kit Reviews - a user site with a large 1/72 scale aircraft reviews along with 1/48 scale ones.

World War I modelling - Dedicated to WWI aircraft modelling and research

WWI Modeler - Another WWI aircraft site

144 Scale Census - an web page dedicated to listing every 144th scale kit out there.

Armor modelling Sites:

Track48 - Exclusively 1/48 Armor

Missing Lynx - big site devoted to Armor

Magazines:

Finescale Modeler Magazine - THE general modelling magazine in the US

Scale Auto - sister magazine to Finescale Modeler for auto modeling

Kalmbach - corporation that owns the above 2 magazines, has link to buy videos and annual issues

Scale Alircraft Modeling - home page of the British magazine

Tamiya Model Magazine - excellent general modelling magazine published in the UK, not just about Tamiya kits.

Model AirPlane International - saem publisher as above, same format, only is exclusively Aircraft

Military Model International - saem publisher as above, same format, only is exclusively Armor & military figures