Just got this news recently. Clicksia and Incentria are both officially shut down by the owner. Completely off, gone forever.
More info here : http://www.emoneyspace.com/forum/index.php/topic,336432.0.html
At EasyHits4U, you have chances to win several bonus, ranging from text ads/banner impressions, credits, drawing tickets (some kind of lottery with its own prizes!), or cash when you surf certain amount of sites. Oh, and not to mention I already got some dollars to cashout there, but maybe will do it later.