Mac OS X Lion - Hold down the character key on your keyboard for a popup menu of the accented variants of said character. Use keyboard numbers for quick selection.
/via Jan van der Asdonk
I think I need Lion in my life…
This looks cool. Although, it’s missing the weirder things like ą, ă, ǎ, ǽ, ǣ, etc. But there probably aren’t many people who need to use those. Although ǎ would be useful for typing in pinyin.