If you are building a blog/site network as discussed in other threads, you'll also want to build a vast link network to spray links all over your blogs and pages.Here's a possible example:
Create 20 screen savers.
Put some on different tin, silver or gold sites, including squdoo etc.
Submit the screen savers to various directories.
Let's say you put the 20 screensavers, 5 each on:
1 squidoo lens
1 free site
1 blog
1 gold/silver hosted domain
Each site above can be sumbitted 5 times to 300+ screen saver directories.
20 screensavers x 300 directories is 6,0000 links to OUR pages, lenses and blogs.
It also creates pages on other IPs and hosting containing your download link and often, a link back to your network.
The big impact isn't from SEO or PageRank. It's that you can now link to your own specific pages within those diretories all across your network.
Here's thousands of links to various IP addresses that you can add to your pages that all point back to you. Links to you will be everywhere.
And when folks download your screensavers, you can use follow-up marketing, both in "readme file" and in the screensavers themselves.
Now, take the same stuff you used for screensavers and make videos.
Upload and submit the videos to all the different video directories.
Gather links to your pages in the directories and add to your RSS network pheeds...You link to pages containing your videos, which lead back to your network.
Of course, your videos also promote your gold sites, using your URL.
Next, we create some video "blogs" using our own videos hosted on various video directories as content.
This creates another link pattern in ADDITION to your screen savers.
Repeat with a few articles submitted to varius directories. Link to the pages containing your articles, which link back to your network.
Summary:
Look for ways to get links on other folks' sites using automation by creating screensavers, videos, software, articles, etc...
Across your own network, link to the pages on the other folks' sites that contain your stuff.