You can get more information about Apache Camel from the following sections.
The Apache Camel Project homepage is http://camel.apache.org. For the most part, this website and Javadoc as well as reading the source code provides enough information to work with Camel on a daily basis. However, sometimes, it is not enough. In this case, check out the following links:
Questions about Apache Camel on StackOverflow can be read at http://stackoverflow.com/questions/tagged/apache-camel. Some questions are answered by Apache Camel maintainers and contributors, so you know that you are getting firsthand information here.
Documentation for FuseSource, which is based on Camel in some cases, is better than the documentation on the Camel project website and can be read at http://fusesource.com/documentation/fuse-mediation-router-documentation/.
Camel documentation on FuseSource: http://fusesource.com/docs/mirrors/camel/ has information on various documentation topics.
Once in a while, there are interesting articles on DZone that can be read at http://java.dzone.com/category/tags/apache-camel and http://java.dzone.com/category/tags/camel, that may help or, at least, give a hint about the solution to a problem.
If you want to expand your knowledge and get a firm grip on Apache Camel and its internal workings, a highly recommended book is Camel In Action by Claus Ibsen and Jonathan Anstey, Manning Publications, December 2010. It is very detailed and covers absolutely all aspects of working with Apache Camel.
James Strachan, http://macstrac.blogspot.com/
Claus Ibsen, http://www.davsclaus.com/
Jon Anstey, http://janstey.blogspot.com/