The website watchmoviesonlineyo.com looks exactly like megaupload.com / megavideo.com and has the link "Install Plugin to Watch Video", when clicked on, will download ifreetv.exe. Downloading any executable program (*.exe) is potentially dangerous and should only be done from a trusted website.
Web of Trust rank this website as having a poor reputation.
I personally do not trust this website, because it is impersonating a very popular video website ( megaupload.com / megavideo.com ). Any website requiring a plugin to watch a movie should not be trusted. You should watch movies using a flash, silverlight, java or divx player.
This is how the website looks

Browser prompting to download the malicious program.
