Yidaki - 2:01 pm on May 25, 2003 (gmt 0)

>While in the case if you exchange links or buy links, you will usually have a heavy one site down keyword phase which Google try to detect.

If you provide your visitors with a "link to us" page that offers a html code with your prefered link text and description, you'll also end with all the same keywords in your backlinks. Nothing dodgy. Perfectly legit.