I was going to write up a C/C++ primer, but I think this will do well…. http://visualcplus.blogspot.com/. Just start with lesson one, and work your way from there.
Now that it’s fallen off of the digg.com top spots, it should be accessible. Just ignore the Windows-centric portions of the tutorials, and it is a good intro to programming, and builds the bridge to learning Obj-C and Cocoa. Most Cocoa tutorials assume you’ve had that experience. If you know C or C++ well, then Aaron Hillegass’ book on Cocoa is a good one.
I recommend studying C or C++ before you attempt to use the tutorials on www.cocoadevcentral.com. Though they’re good, it’s still a good idea to come to the table with something when you start. From there, you might be able to glean more info from www.cocoadev.com. I advise against posting there right away, as the cocoadev wiki users can be a little rough to “newbies”. But, it’s certainly a place to start.