RC Community Sites

General Sites:

http://www.rcgroups.com
A site for all things RC: Planes, Helis, Cars, Boats, etc. Large following in the Plane forums, not as many users in the heli forums as some of the sites mentioned below but an amazing resource for anyone. 

http://www.rcuniverse.com
Another Site for all things RC, one of the largest communities next to RC groups.

Plane Sites:

http://www.wattflyer.com
This site is dedicated to Electric RC, while it has categories for Heli's its not very big or well followed. This site is really good for lightweight electric planes and park flyers.

Heli Sites:

http://www.helifreaks.com
Home of the celebrity 'Finless Bob" and his helicopter build videos. Bob is a cool cat and gives his honest opinion (good or bad) about all the models currently out.

http://www.runryder.com
Anyone and anybody that fly's helis is typically on this site. Considered by many as 'THE' premiere helicopter forum. The owner Mark Ryder shoots HD video of most of the main events, contests and interviews the top pilots from around the globe.

This page allows comments so if you have another site you would like to recommend please leave it in the comments along with a description of why you love it!