Mini DisplayPort is the current digital standard on all current Macs to transfer video to an external display or TV. It has been introduced in 10/2008 with the release of the Unibody MacBook and MacBook Pros and has gradually been adopted on all other Macs.
MDP is capable of transmitting video, and since 2010, audio too. MDP is a miniaturised version of DisplayPort. It is also license free and can support resolutions of up to 2560 x 1600, which Mini DVI and Micro DVI are not able to do.
Since 2011, all Macs come with a Thunderbolt port, which is meant for fast data transfer and also as means to connect to an external display device to mirror or extend the Mac's screen.
To learn more about Thunderbolt (TB) and its compatibility with Mini DisplayPort (MDP): Introducing Thunderbolt
MDP adapters and cables can be bought online from:
If you want full resolution on that 30-inch display, then you need the listed mDP to dual-link adapter. Apple's is almost $100 - and Monoprice has a similar one for less than $75. Apple's provides a USB connection to the display. The Monoprice adapter uses USB for extra power, but not for connection to the USB ports on the display. Both give you the full res video, however.
And, yes, photos and videos will look good.
simsaladimbamba meant "supports the 2560 x 1600 pixel" - I'm guessing