If you want a text tutorial along with the video, check it out at my website here: http://www.allhow2s.com/how-to-do-gpu-bitcoin-mining-on-a-mac-with-diablo-miner/
This is an in depth video on how to do GPU Bitcoin mining on an Apple computer with OSX (will work on Leopard, Snow Leopard, Lion, and Mountain Lion) with DiabloMiner. The video is done on Windows, but the exact same process applies to mining on a Mac (I just didn't have access to a Mac to make the video with, but I have done mining on Macs). If you have any wonky things happening that didn't happen in my video, leave a comment and read the readme that came with DiabloMiner.
The mining pool site (where you set up an account): http://cur.lv/s601
The site to download DiabloMiner: http://cur.lv/ufgd
command to start GPU mining (has to be run in the directory where the program is): ./DiabloMiner-OSX.sh -u pascal11110.guest -p guest -o api.bitcoin.cz -r 8332 -w 64
Replace pascal11110.guest with your username, guest with your password, api.bitcoin.cz with your mining pools address, and 8332 with you mining pools port. If you have any issues connecting, then try my credentials to see if those work. If they do, then you have typed some of your info in wrong.
The client I use as my Bitcoin wallet is Bitcoin qt, which can be downloaded here: http://cur.lv/s5x7
A great chart of what to expect for speeds for a piece of hardware can be found here: http://cur.lv/s5xb
Want to get free bitcoins? It doesn't pay much, but if you're just starting out and want a few for your wallet, you can get very small amounts of free coins from this site for visiting other websites: http://cur.lv/s5xh
And this one gives you small amounts for just putting in your receiving address every day: http://cur.lv/s5xk
You can also earn bitcoins by having people click on URL's you shorten, it just takes them to an ad before it brings them to the site it was linking to, works very well: http://adf.ly/NydBX
I now accept donations through Bitcoins! If you don't know what those are, you can get more information about them at bitcoin.org. My average donations are usually less than .001 BTC, but any amount helps me to make more tutorial videos, so any amount is gladly accepted.
Check out my facebook at: https://www.facebook.com/pages/All-How-2s/198429346974010
or my twitter: https://twitter.com/AllHow2s
Or my website where I have a lot of other great tutorials (such as how to take a screenshot, or how to get the start button back on Windows 8): www.allhow2s.com