Well, I have heard they lose it when it expires (google watches for the expirations). But, probably next major spidering, you will get a PR again if lots of people are linking to you. Google is now more influenced on what your a href tags say then earlier, so unless the domain is similar to yours in content, it isn't worth nearly as much as it used to be earlier this year.
ZoiNk
__________________
"People can have the Model T in any color - so long as it's black." - Henry Ford
|