One-way links are a powerful way of optimising your site, but unfortunately many of the techniques are open to abuse by spammers.
Tag and Ping is the latest technique that is doing the rounds of Internet marketers at the moment. The details of the technique are apparently that you sign up with several accounts at social bookmark sites such as del.icio.us, and promote your own site(s) in all of those accounts.
You should be aware that this technique is unlikely to work for much longer. The del.icio.us social bookmarking site has implemented the rel=nofollow tag, which means that the links will not have any value for SEO purposes. Just take a look at the del.icio.us home page, if you don’t believe me; in the source code, you will see the rel=nofollow tag for the external links. My opinion is that similar sites are likely to follow suit if they haven’t done so already.
I recommend that you don’t waste your money on products that promote Tag and Ping methods to elevate your website rankings.
David Thomas, The Affiliate Marketer