Newbieeeeee: Contrast Detect AF is pretty much like how you'd manual focus a lens from looking at the screen alone - keep turning it until it gets contrasty.
Phase Detect AF uses a pair of AF sensors, one looking from the left, the other from the right. It sees how far the same image is from each other in the left and right sensor, and knows exactly where to focus based on this.
If you've seen a split-prism viewfinder you'll know exactly what I mean.
deadangel: Well you'd need to get a faster card, unfortunately - you have a few options:
1) Sony Memory Stick Pro Duo HG (read 50MB/s, minimum write 15MB/s, maximum write 20MB/s)
2) Sandisk Extreme Pro UHS-1 (read 45MB/s, write 45MB/s)
3) Sandisk Extreme Pro UHS-1 (read 95MB/s, write 90MB/s)
4) Toshiba UHS-1 (read 95MB/s, write 80MB/s)
5) Delkin Elite633 UHS-1 (read 95MB/s, write 45MB/s)
Note that the read speed is written on the package - this is the only way to tell between say the Sony MSPD 50MB/s and the older MSPD 30MB/s.
Eh, after a burst, it should only hang for 20 seconds or so on a MSPD 30MB/s card.
oh. Googled it but didn't understand, so ask here. So which is better?