flash_recovery_area size reporting

Hi I had a little whoopsie yesterday on my test database (10.2.0.1.0) with the db_recovery_file_dest becomming full and me getting the following message in my alert log: ORA-19815: WARNING: db_recovery_file_dest_size of 2147483648 bytes is 100.00% used, and has 0 remaining bytes available. well, I recovered from this but thought it might make a good exersize to