One thing I do from time to time is to open a file to write to it in the STDOUT filehandle... (and I am also known for reading a file via STDIN)
This saves me the time (and keystrokes) of using a filehandle name (or even picking one up).
Today, for the first time ever, this caused me a bug (fortunately, it only took me about 10 minutes to figure out what was happening)... you see, I was printing debugging information which was screwing up the output file...
Always remember, print your debug information on STDERR at all times :-)
Save time and spell it warn.
