SEOClerks - The largest SEO Marketplace on the planet. - SEOClerks
Pramp for Product Managers - Practice product management mock interviews with other PMs
Picoworkers - Earn money from doing short, easy tasks similar to Microworkers. Picoworkers is the best alternative to Microworkers I ever find.
The PM Interview - Practice PM Interview Questions (w/ timer).
SerpClix - SerpClix is a click exchange network used to send more real clicks to your Google SERP. You can click to earn money or buy clicks to rank higher on Google.
Speechapp - The simplest way to practice for your next job interview