Software

Firefox
If you're still using IE, you should give this browser a chance. It's faster and more up to date than IE. It is available for all platforms and there is no reason why you shouldn't at least try it.

Thunderbird
Like Firefox, Thunderbird is made by The Mozilla Organization. It's an email client that is very user friendly.

Tomato Torrent
Tomato Torrent is a BitTorrent client for Mac. It has a lot more features and options than the official Macintosh client. You have a little more control over your Torrent downloads.

TeXShop
Tired of using Word to make your documents? Why don't you give LaTeX a try.