zipping it up

I just went to submitted a file to a flash showcase, one of the requirements was to send a zipped file containing the original fla (the wording document containing the editable animation) my first reaction was to think whats the point of zipping a file thats only a couple of hundred k, but i guess some complex files may be alot bigger so it sort of made sense. My next thought was guess i'll have to wait until i get to the office and can zip the file on my pc, zip being a pc thing right? then i googled zipping mac files. Looks like i was wrong, while pc users have to purchase a copy of something like winzip, its built right into the mac tiger and above. All you do is select a file or collection of files, click ctrl and select compress...instant zip file. I am so loving my mac again.