Quick Look's use of the space bar in the Finder, doesn't interfere as long as there are characters in front of the space. Where it interferes with typing filenames in the Finder, is when you want to shift focus to the topmost item in a Finder window by hitting the space bar (something I do all the time, or used to be able to do)--you can't do that any more, unless someone's figured out how to disable the space bar activation of Quick Look.

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I had this habit as well from the beginning of the Mac OS thru Tiger_

Leopard screwed up much_ C'est le Vie_

Anyway - if you hold down either Option or Shift and then press the Space Bar it will focus to the first file in the folder_

Shift + Space

or

Option + Space

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