LFE's "Linkwheel" creation is also something to be looked into. It automatically interlinks the blogs to give you maximum search engine rankings. You can either interlink all of the blogs or skip blog interlinking to make less of a footprint on your sites.
Personally I have gained very high search engine rankings without the use of interlinking, but I'm sure you can figure out the perfect interlinking formula to provide the best rankings.
Along with Wordpress account creation, it also also has a "Pligg Blaster". This software allows you to submit your links on websites like Digg 100% automatically - no email verification required.
What's the buy status for LFE? Recommended.