Haven't got any updates in a while. games.reveur.de site (addon sceneries section) has most of these maps hosted ;)

This list contains all World Racing 2 fan made add-on maps I know of. Each entry has a link to original location (be it thread in forum or authors site). 

• Alps straight conversion from MBWR done by Krom
  available at http://krom.reveur.de
   

• Arab drift map scratch made map by SevrouK
  available at The Borg Gaming website forum
   

• Australia straight conversion from MBWR done by Krom
  available at http://krom.reveur.de
   

• Autobahn straight conversion from AFC11N done by Krom
  available at http://krom.reveur.de
   

• Dunsfold Airfield (aka Top Gear test track) scratch made by SevrouK
  available at The Borg Gaming website forum
   

• Forest Hills scratch made map by Curry
  available at Synetic forum
   

• Italy In Snow winter mod + night mod of WR2 Italy, made by HanSolo
  available at http://www.games.reveur.de/
   

• Nevada straight conversion from MBWR + night mod, done by bvb09jo
  available at Synetic forum
   

• SCA - Test Track - Forrest scratch made map by S'Calain
  available at games.reveur.de
   

• Snow Rally scratch made map by Curry
  available at Synetic forum
   

• Stadt straight conversion from MBWR done by Krom and HanSolo
  available at http://krom.reveur.de
  

• The Pass scratch made map by Curry
  available at Synetic forum

• Weekend Drive scratch made by Tor Arne Hustvedt for Racer and converted to WR2 by Jani
  available at Borgs forum

Following maps are known to be in progress:
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• Albert Park - Melbourne by Pedro_Boticas (beta available)

• Autobahn Country Club by LaPimpa

• Dunsfold Airfield by Stew2000 (TopGear track) (canceled?)

• Drag strip scratch made by Ayce1955 (1/4 mile strip) (video available)

• Erstes eigenes by BigBoy

• FTL scratch made by Curry, Jey Bee, J.S.Paint and Abstandhalterin (beta available)

• FSZ Embsen scratch made by Lamborghini Driver

• Haifa city by SevrouK (freezed)

• IndustrialZone from NFS5 conversion by Krom (topic)

• Japan from MBWR conversion by bvb09jo

• Konne (Konne) scratch made by WorldRacer

• Landstrasse from AFC11N conversion by AudiMaster (Beta available)

• Leipzig Porsche Test Track by magpie and conversion by LS134 (Beta available)

• LeMans by Pedro_Boticas

• Mannheim by einzelgänger07

• Mexiko MBWR map conversion by gamer94 (aka Patrick)

• Moritz Autoschmiede Testtrack by Moritz

• Normandie from NFS5 conversion by Krom

• Nürburgring Nordschleife by GEETi (RACER) & Jani

• Polish Roads 2006 Stage 2 by Lato conversion by TomWin (Beta available)

• Rainbow Road by CoolK (beta available)

• Swiss Mountains by Tobias Greuter conversion by TomWin

• Vice City airport area from GTA conversion by SevrouK

• Village from scratch by HanSolo (early WIP)