Hi Xistenz,
A very nice way to tweak and trim your hosts file is the program hostess . Iconnu on this forum told me how it works. I used it now to put a couple of hostsfiles together, and also added the Spybot S&D hostfile. These hosts are all automatically arranged. I noted the checksum of the hosts file, and it works great for me. You have to include Spybot S&D's but else you get a false positive on scanning after hostess.exe has altered the hosts file. The false positive is for MySoft. Whenever you use hosts for blocking access to your machine, you have to be a aware that worms (e.g. MyTob) & various scams can alter your hostfile, place the url's of AV update sites next to 127.0.0.0, making it impossible to download your last av definitions. Clean it out with hostess, delete, and safe as a new hostsfile. If you have not got hostess, you can rename hosts as Oldhosts.txt, work on it with notepad, delete the wrong local sites, then save as hosts, and go on,
Have a nice day in the RSA,
polonus