Nice advice Tom but I am not using any free sites... All of my blogs/websites are self hosted with top level domains..
Yes these are good niches but it is also important that you have more clicks from US traffic as more advertisers in this niche come from US/ AUS / Europe region.
You are right, I could not publish my squidoo lens because thet said it was "spambait"! Anyway I sent it in for manual review, lets see what happens!
I use articles and social bookmarking plus forum signatures... Not using squidoo...low quality traffic from free sites..