Enter a reason for deleting this comment
If I cross-link my blogs together, will it provide me with good backlinks? How closely should the sites be related before I can add a link to the sidebar?
Here's what Matt Cutts has to say about cross-linking from unrelated sites.
For one thing, he mentioned about how sites need to have something in common when cross-linking. So if one blog is about internet marketing and the next one of about doll collecting or recipes, then you might want to hold off and just find a better place to get a backlink.
Be careful about backlinking unrelated blogs. However, it might be OK to backlink from a more generic blog or forum if the page yo are getting the backlink from is more closely related to the page it's linking to.