Linking to your site from myspace comments - good or bad idea? It's a one way link, it's not bought - but is it frowned upon by G?
it does not have a weight in search engine but it can sure help your site in promotional way so for me it is a one way of generating traffic for your site so for me it is a good links.
I think there is nothing to underestimate.........It certainly is a good marketng scheme..but have to play within the rules....