If you're an iWork 08 user, then you may want to run a software update, as Apple has just pushed out updates for all three applications. As ever, there's hugely informative release notes: for Pages 3.0.2 and Numbers 1.0.2 "[t]his update addresses compatibility with Mac OS X" while the Keynote 4.0.2 update "primarily addresses performance issues while playing or exporting presentations."
On the TUAW Intel testbed here in the UK, the updates weigh in at 32.4MB, 29.3MB and 27.4MB for Keynote, Pages and Numbers respectively.
Keynote 4.0.2 at Apple.com
Pages 3.0.2 at Apple.com
Numbers 1.0.2 at Apple.com
Thanks to all those who sent this in!