Demand Media, the search-driven publisher of eHow and other sites
and domain registrar, has filed a S1 to do an initial public offering. The company has revenues of about $250 million per year and is looking to raise up to $125 million on a $1-1.5 billion valuation.
Search Engine Land goes into some of Demand Media's Google-related risks (the article even mentions the Geosign debacle). The industry often talk about the Facebook platform, but for most online companies, including Demand Media, the Google ecosystem is still much more important as it provides both traffic and monetization.