Hi there!
I know that part of this functionality is in profile core, when you set a title for the profile page for a specific field.
The thing that you don´t have in core or in any other place (nor with ANY other module, belive me, I´ve looked for) is a set of permissions that shows the page ONLY to users that shares the same info inside a specific profile field.
ie.:
John selected "red" in "your favourite color" profile field.
Marcus selected "red" in "your favourite color" profile field.
Mary selected "red" in "your favourite color" profile field.
Tim selected "blue" in "your favourite color" profile field.
Sam selected "blue" in "your favourite color" profile field.

So, when Tim logs in, and he goes to "your favourite color" "see all" link inside his profile, he only sees listed in that page Tim and Sam.

When Mary logs in, and goes to "your favourite color" "see all" link inside her profile, she only sees listad there John, Marcus and herself.

Could anything like this be possible? Is there a plan for D6?

Thanks!
Rosamunda