Here are some of my top tips for additional OS X functions, most have come from my experience at home and work.
1. Plugging in a TV or Second Monitor
Most Mac models come with an external connector for attaching additional screens (normally a mini DVI connector). From this you need a mini DVI to DVI connector then another cable to plug into your screen, this can be a DVI to VGA cable, DVI to DVI cable or as I have a DVI to HDMI cable. All the cables are very cheap and can normally be picked up from Ebay.
OS X should automatically detect the second screen plugged in and you can open system preferences to adjust the resolution. You may have to play around with the settings, my 26" LG HD TV looks best on 1280 x 720 rather than its native resolution.
I've had my iMac plugged into my TV for the past 6 months and people still think its cool how I can move my mouse from one screen to another.
2. Sharing your Internet over Wireless.
While I was at University our local cable supplier didn't give out free wireless routers so to save buying one I shared the Internet out through my iMac's wireless. In Leopard the Internet can be shared from the Sharing section in System Preferences.
3. Bluetooth Internet Through Your Phone
It usually takes ISP's about two weeks to put ADSL on a phone line. Clearly I couldn't be without Internet for two weeks so I turned to my mobile phone provider (T-Mobile) to hook me up to the net. Now that 3G signal is well established (and I have a 3G phone) I got speeds of around 3mb for
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