Is it worth it to switch from Safari to Leopard?

I think you’re confused. Safari is a web browser, Leopard is an operating system. If you took the time to fill out the description portion, I might have been able to help you.

Spargett, you’re right. I wasn’t thinking this a.m.

Time Machine alone is worth the upgrade to Leopard (from Tiger).

That said, it’s expected that Mac OS X 10.6 (Snow Leopard) will be released later this year. If you’ve waited this long already, you probably can wait for Snow Leopard. It, however, will only run on Intel-based Macs… PowerPC-based Macs are left out in the cold from that point forward.

what robmandu said. Don’t go out buying it if you’ve waited this long. But yes, it’s well worth the upgrade. Spaces is an awesome feature (if you like to multitask), among other things. But I would wait in your case for the Snow Leopard release (assuming you have an intel based mac).