Google announced earlier this week that it has formed a Mac Engineering Team and started the Google Mac Blog. In its first post, that blog states its aim

It means making products that everyone can use – including Mac users. We want to provide great products and services to the tens of millions of Mac users around the world, because it’s the right thing to do, and because Mac users inside and outside Google demand it.

Google also has made the following available at www.google.com/mac:

• Dashboard widgets for checking Gmail, posting to your blog, and checking your search history

• Google Notifier that alerts you to new Gmail messages and (a Mac-only feature) upcoming Google Calendar events
• Safari support for Google Calendar
• Mac support for Google Video
• Mac version of Google Earth