Try this also:
Empty Safari's cache (from the Safari menu), then close Safari.
Go to Home/Library/Safari and delete the following files:
form values
download.plist
Then go to Home/Library/Preferences and delete
com.apple.Safari.plist
Repair permissions.
Have you installed this:
Apple has released an updated version of its recently-released Security Update 2007-209.
Available for Leopard and Tiger systems, Apple issued the revised set of patches (three are available) in order to address a Safari problem created by the previous version of the same patch.
Some users have note that Security Update 2007-009 caused Safari to crash when loading certain websites once the patch was installed. Security Update 2007-009 1.1 puts Safari right again, according to Apple.
The updated patch is available using Software Update, or directly from Apple at
http://www.apple.com/downloads/macosx/apple/
As with all updates and software installations, you should repair permissions before installing, restart, then repair permissions again.