Several Mac-using writers have contacted me to let them know how the upgrade went, so I hope this information helps you.
The upgrade to Leopard took around two hours, and went very smoothly, no hiccups at all. All my peripherals work, even my Palm, which was temperamental on Tiger.
My Mac writing tools all work fine; MS Office apps work, and so does Scrivener. I've covered writing tools on the Mac before, so I won't list them all again, but I've used them all under Leopard now, and they're fine.
Adobe's not updating older products for Leopard, but Adobe Creative Suite 3 applications will be updated in December. I'm still on version 8 for Dreamweaver and Fireworks, and they both work great under Leopard, so no hassles there.
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