[powrtoch]

"Nothing lives longer than temporary code."

Love this quote. I assumed it was an existing quote/idiom, but it looks to be original.

[sinkhole]

My personal version is "Broken gets fixed, shoddy lasts forever" http://mattrose.github.com/2009/02/04/broken-gets-fixed-shod...

[brandonsavage]

It's not original to me. Not sure where I heard it, but I know it's not mine.

[npsimons]

Thus spake the master programmer: "Though a program be but three lines long, someday it will have to be maintained." -- Geoffrey James, "The Tao of Programming"

[janus]

Nothing is more permanent than the temporary: http://www.poetryfoundation.org/poetrymagazine/poem/243216