You won't have any problems just opening and closing jpegs to look at, etc. The problem comes when you want to change them in any way, which then requires a 'save.' It's at this stage that saving them as tifs is most useful.
With the prices of memory cards so reasonable for 1Gb and above nowadays, the main reason to choose either jpg or tif or RAW (if your camera has it) is the speed at which your camera can write the file to the card.
many modern compact digicams just have jpg available which is fine for speed and for normal sized photos is not a great problem- saving a file just once as a jpg will not be too harmful
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