Do you have any unusual startup items? I've heard of things like Application Enhancer causing issues, although it's never given me any problems.
You could try re-installing Tiger if you don't want to make the move to Leopard. Using the "Archive and Install" option with the install disc that came with it will move your current stuff to one side and do a clean install of the OS - it's then straightforward to put your stuff back, although you should of course do a full backup first

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