Try using everything that comes with your mac! There's plenty todo without any extra programs! Garage band is a good laugh...erm and if you whack a few photos in iphoto have a fiddle around with the photo settings and you can get some cool things goin on!
As for other random free programs... Quicksilver is a must, Adium X is good, MPEG streamclip is handy for any video that quicktime wont play...though you should probably download VLC aswel.
Im a bit of mac geek so if there is anything you need answering i'll be happy to help!
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