Apple today released Safari 4.0.5 which is recommended for all Safari users and includes improvements to performance, stability, and security including:

• Performance improvements for Top Sites
• Stability improvements for 3rd-party plug-ins
• Stability improvements for websites with online forms and Scalable Vector Graphics
• Fixes an issue that prevented Safari from changing settings on some Linksys routers

Safari 4.0.5 is available via Software Update and also as a standalone installer.

More info and download links (30.52 MB (Snow Leopard), 38.59 MB (Leopard), 26.78 MB (Tiger), 30.18 MB (Windows)) here.