Apple has released updates to Safari and iWeb which contain improvements to compatibility and security.
Safari 5.0.2 Software Update: This update contains improvements to compatibility and security, including the following:
● Fixes an issue that could prevent users from submitting web forms ● Fixes an issue that could cause web content to display incorrectly when viewing a Google Image result with Flash 10.1 installed ● Establishes an encrypted, authenticated connection to the Safari Extensions Gallery