To post a quick follow-up, there are three "file descriptors" you need to get to know: stdin(0), stdout(1), stderr(2). There's all kinds of nifty things you can do with stdout and stderr...you just have to give the file descriptor *number* (2 in my above post for "stderr").
The beauty of using 2>/dev/null (send all data on stderr to the bit bucket) is that it works with ANY command without touching the "normal" stdout data.
You can also combine stdout and stderr like such:
$ some_command >/dev/null 2>&1 # ">/dev/null" assumes stdout, "2>&1" redirects stderr to stdout (and hence, to /dev/null in this example).