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Not yet.
I didn't have any use for the sidebar apps and gadgets in Vista or W7, and so far I don't see much use for live tiles either. My desktop is usually hidden behind all the tiled application windows; screen real estate is too valuable to me to allocate any to trivial applets.

There may be something I'll have a use for eventually, but I said that about Vista gadgets too. I never found anything useful there or in W7.
Updated - 5th Oct