I have bought several very good 1 word domains. I have deleoped each site with about 5 pages each with over 300 words on each page, each keyword I am targeting gets about 100 uniques a day. All sites have SEO work and a few backlinks on all sites. Will all of my new sites be in the sandbox automatically since they are brand new domains? How long until I rank good for a certain keyword on Google and Yahoo. Please advice!
Yahoo! reverses it; new sites can rise to the top (probably to test clickthroughs and clickbacks). You will not necessarily be penalized in G unless you are targetting competitive or commercial words/phrases. That doesn't mean you will rank well though.