You'll be paying more for Medicare Part B next year.   The monthly premium is expected to increase from $88.50 to $99.50 in 2007.  In addition to this base rate, higher income seniors will have an additional surcharge ranging from 13.3% to 73.3% tacked on to their Part B premium.  

Kiplingers provides the details of the new  means test for Medicare.

Here's how it works: If you're single with a modified AGI between $80,000 and $100,000, your surcharge will be 13.3% of the base monthly premium of $99.50, which will add $13.20 to your monthly premium, for a total of $112.70. For those who are single with an income above $200,000, the surcharge will be 73.3% of $99.50, or $72.90 - for a total monthly premium of $172.40