This is the LEAST helpful post that anyone could have possibly posted. I tried to give you less karma, but realized I already had you at 0, and for good reason. Anyone could find that information with relative ease, but he didn't ask for all the specs of the two computers, he asked for differences.
The main differences you will need to be aware of are the following...
-Screen Size-
the Macbook has a 13.3" screen while the macbook pro has either a 15 or 17" screen
-Video Card-
the macbook has its video card built into the motherboard that shares the computer ram to run. The macbook pro has a separate video card with its own memory that does not take away from the system's memory.
-Ports-
The macbook pro has a few extra and different ports than the macbook. Rather than having a mini-dvi port that requires an adapter to plug in an external monitor. It also has Firewire 800 along with firewire 400, where as the macbook only has firewire 400. The macbook pro also has an express card slot which the macbook doesn't have.
-Weight-
The macbook weighs 5lbs while the macbook pro weighs 5.4 lbs in the 15" and 6.8lb for the 17".
There are some other small differences between the two such as the backlit keyboard on the macbook pro, but these are going to be the important differences.
So you really have to ask yourself what you are going to use the computer for. If you are going to be using your computer for intensive tasks like REAL video editing, gaming, and etc., then get the macbook pro. If you are going to be doing anything less, get the macbook. It is more compact, and does a damned good job for what it is made for. I have a macbook right now and love it, but am upgrading to the pro because I do a lot of video editing in HD, but otherwise the macbook would be fine.
What I think you should probably do...
-Get a used macbook that is less than 1 year old.
-If it doesn't have it, get applecare.
-Upgrade RAM through a company that has notoriously worked well with macs (4gb if you can, but 2 should suffice)
-Enjoy
Cheers,
Ryan