cross linking

[http]

I have two websites. Content is related but not duplicated.
If I cross link these two sites back and fourth is there a possibility that either will be penalized for cross linking?

As I understand it, the key word regarding cross linking is "excessive" cross linking. But what would the engines considere "excessive".

[O~Snapple]

The Larger the cycle the better but i dont think you will be penilized for one link just be careful

~Snapple

[NextWarrenBuffett]

I think you will be fine, just dont put numerous links to each other

[ISU]

no Its ok..recipocles links are ok for you..its like a link exchange..dont worry everything its so safe I give you my promise..