Hi @Jonathan Sampson:
There are several plugins to make Custom Post Types easier and some allow you to define Custom Fields too, in no particular order:
As I mentioned above I’ve been working on one that does not provide a User Interface like these to instead an extensible API for complex field types (and simple ones too.) But after spending an hour trying to package it I realized it’s not ready for distribution yet. Maybe in a few weeks.
These plugins listed above should meet your basic needs for now and I will try to make mine compatible with the data stored by all of these in the future in case you do decided to use mine in the future.
You also might find this post a bit of help too: