Instead of one long exposure, I used a script in CHDK to shoot 280 13-second frames, then a program called StarStaX to combine those into an apparent 70-minute exposure.
The brightest streak, at bottom-center is Venus. The other bright streak is Capella, a magnitude 0.5 star a mere 42.2 light years away.
Canon Powershot S3IS with CHDK added, May 14, 2012.
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