What should my folder permissions look like?

[eluser]kaos78414[/eluser]
The title pretty much says it all; I haven't moved my site to a server yet, (just building it locally and getting some much needed practice with codeigniter), but when I do, I was curious as to how my folder permissions should look? I'm sure some folders need stricter permissions then others, but for the ones that need to remain writable, like the cache folder, should I 777 it or...? (As you can tell I'm a bit new to folder permissions)