I noticed I was making a lot of double letter typos, so I went into
System > Preferences > Hardward > Keyboard
and made the delay as long as possible, but this had little effect. The delay is still too short.
Under Fedora 9, keyboard was fine. On Fedora 10, I noticed this since installing the beta on October 1.
My smolt profile: http://www.smolts.org/show?uuid=pub_3eb65d6c-6aa7-48d6-860b-7c3e965cd954