Wondering, how do you link your websites. Do you have any tactics, schemes. Or you just simply link each to all and all to each?
I link all my sites to and from my company site - so, it's the hub. It's a straightforward way of linking because they are built by my company. My site says "We built xxx" and their site says "built by Cybernautix". "schemes" are a way of maniuplating the search engines, 3-ways or link patterns, however you like to call them and G's algorithim is constantly updated to look for these things.
I just do site submissions on directories, or any site submission sites. Or if you want, do link exchanges or post in forums with a link in your signature.
submit to article submission sites keep your links in your forum threads approach sites within your niche for a link exchange do viral marketing by giving away free stuff