Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Having the same problem

I get the same thing as well. The gmail problem is random. I've not been able to pin it down to any one cause. But I've actually had nothing but trouble with Safari 4. Every time I try to write a message on Facebook it crashes as well. So much for being "crash proof".
 
Cannot establish secure connection

Not an infinite redirect, but I have noticed that I cannot log into gmail through Safari when using a managed user account, but can when using an administrator or standard account. I says it cannot establish a secure connection when trying to log in under the managed user.
 
If Safari is dicking you around with an infinite loop of trying to log in, you need to remove the Gmail cookie in your browser and reload the page
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.