[Tikigod]

Best thing that happened to IL2 is the hyperlobby client that connects everyone to coop, online campaigns, and join-in-progress team on team missions.

You can download it here:
http://hyperfighter.sk/

Other than that the only modding you can do is collect and replace aircraft and pilot skins.

Sites with skins:
http://forums.ubi.com/eve/ubb.x?a=fr...102&f=45410763
http://www.1java.org
http://www.simmerspaintshop.com/
http://www.flying-legends.net/
http://members.cox.net/cx570578a/_htmdir/_HomePg.html
http://www.cptfarrels.com/
http://www.gavca.com/
http://www.flugzeugwerk.net/
http://www.nnavirex.com/
http://www.il2-skins.de/index.html
http://zargos-skins.checksix-fr.com/home_gb.htm
http://www.rowlinson.ca/il2/FB_Skins.shtml
http://il2skins.free.fr/
http://personal.telefonica.terra.es...asasa/index.htm
www.freewebs.com/il2skins
www.warwingsart.com
http://www.warcry.hu/
http://www.vpmedia.hu/il2/
http://rafiger.de/
http://sturmoajosse.free.fr/
http://www.robert-stuart.me.uk/il2/downloads/
http://www.theafsg.com/
http://www.netwings.org/library/For...ns/index-3.html
http://www.canons-skins.com/
http://www.777avg.com/skins/
http://pavlac.free.fr/
http://www.checksix-fr.com/
http://foobarskins.mexxoft.com?lan=en
http://www.web-wings.co.uk/chrisbroad/VWA/
http://www.virtualwarbirdart.co.uk/

Instructional Videos on how to high-altitude level bomb, dive bomb, skip bomb, and avoid AA defenses.
http://www.darts-page.com/

Other Utilities I use:
http://www.uberdemon.com/ (Single and Multiplayer Mission Generator)
http://www.lowengrin.com (Single and Multiplayer Campaign Generator)
IL2 Manager (for tweaking the game)
Hardball's Aircraft Viewer (to compare stats of one plane with another)
IL2 Stab (for tweaking the game)

This is currently the popular site for updated downloads:
http://mission4today.com/index.php?name=Downloads&c=1