The community around Robocode is using the RoboWiki as communication channel. At the RoboWiki, people share new ideas, code snippets, algorithms, strategies, and lots of other stuff about Robocode. New official documentation from the developers of Robocode will be put at the RoboWiki as well.
On the RoboWiki, these strategies are provided:

• Radar
• Movement
• Targeting

The code snippets are also provided on the RoboWiki:

• Code Snippets