WebWalla - 4:12 pm on Mar 8, 2005 (gmt 0)

If you already have more than 3000 or 4000 organic links to this site then I think you should be safe, but if these links are going to be a very large percentage of the total number then I would be very wary of using them, particularly if they all come from the same site.

Definitely vary the keywords and definitely link to different pages.

I have no hard proof of any of this (who has?) but that's just my impression based on certain observations of how my own sites have performed.