Whilst I think this tip is quite fundamental, it's worth noting. Being able to direct output from the Eclipse console to a file, particularly if there are warnings generated from a program you have little to no control over and the file is rather large, and the start of the output goes off the console screen.
To redirect to a file simply:
1. Go to the Run menu
2. Run-> Run Configurations
3. Go to Common tab
4. Tick file on standard input/output
5. The console output will then be written to that file.