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Definately shoot in raw. And follow Octanes advice.
Also bear in mind that DSLRs are not meant to take loooonnnng exposures.
The 'Bulb' setting is really a hold-over from the days of Ektachrome 64 and before, where the studio would be darkened and the image exposed with flash units.
Also the number of pixels has IMHO, passed the point of diminishing returns. Images on the 50D are noticably more noisy than those on the 40D (check out the comparisons on dpreview.com). Even with the truly amazing DIGIC processing, it still can't account for all situations.
Stick with shorter exposures and try to shoot at around 400-640 ISO. That should help some.
Happy snapping!
Peter
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