Also, Safari 3 is beta software, meaning that it's not intended for day-to-day use, and is only aimed at those adventurous enough to be testers for brand-new, yet-to-be-released software. It is not the final release of the software, and it should only be installed for testing purposes.
Any problems you have with Safari 3 should be reported to Apple via the bug report functionality in Safari 3.
Again, if you intend to use Safari to browse the internet day-to-day, stick with Safari 2. On the other hand, if you're willing to be a guinea pig and wish to help Apple sort out bugs with the next version of their web browser, keep using Safari 3 -- but be fully aware that it is beta software, and most definitely has bugs -- some of which may prevent it from being useful to you at all.