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About the market likely rebounding, and then some, before those 25 years have passed, so I have naught to add to that.
However, my own financial adviser told me--when I called her, freaking out, a couple of weeks ago--was exactly what you are already doing (after she helped me re-arrange my portfolio a bit):
"Don't open your statements until at least 2011."
She also left me with a great quote by Warren Buffett:
"Be greedy when people are fearful, and fearful when people are greedy."
You're buying stuff at fire sale prices right now. Buy low, sell high: this is what "buying low" feels like.
Relax and have a glass of wine. It'll be OK.