I search the forum and did not found a clear response about this topic.
Also watching baclinks profiles of some sites, I see that massive sidebar links (i.e. blog-rolls) or footer links using the same anchor text works for example in high competition niches.
For example you can see that works for some designers that offer themes for scripts or wordpress...
This technique, works? is black hat? is spam? they have less value?
Regards
Martin