Which bit of code do you think is more maintainable by someone other than the original developer:

if(_speakerTypeCode == 543678){

//do something

}

or

enum SpeakerTypes {

HornLoaded = 543678,

Electrostatic = 12334
}

if(_speakerTypeCode.Equals( SpeakerTypes.HornLoaded)){

//do something

}

I'm still amazed at some of the things I find in code, sometimes even my own code.  The above monstrosity is not mine, although I do occasionally find something abhorrent in my own code.  I read a blog recently, I believe it was the Shade Tree Developer, who said that this is a great way to gage personal growth.  Go back and look at code you wrote and see if you find things that you'd never do today.