Users are reporting that Google Calendar
now officially supports Safari. I can confirm, as I no longer receive the 'unsupported browser' warning on 10.4.6, and I must say gCal looks a bit nicer in Safari, though I unfortunately need to use Firefox for most of my browsing needs.
It's nice to see Google going the extra mile to support Apple's browser with some of their products. Anyone want to place bets as to how soon a Safari-compatible chat will show up in Gmail?