There's a few good websites, my favourite is www.surfthechannel.com, it has most shows and nearly every episode of them. No downloading o anything. Most of the episodes are also on fanpop, just type in the episode name o season number and episode number, and tu should get a few enlaces o videos for them.
this then directs me to a website, with a link for supernovatube. when house starts playing on the screen, i then download it via the veoh toolbar so i can save it and can watch it offline and whenever i want :D
its the best in my opinion, and no viruses for me :)
Also, lots of people post great enlaces to episodes right here in the House MD Spot. There are always a few of us that will go through the enlaces that are publicado here checking for spam. However, when we find good enlaces to episodes, we rate then highly and usually leave a comentario saying that it is good. Bad enlaces will be rated low and have a comentario about why it is bad (ie survey, downloads required and so on). So tu will always be able to get a good link to an episde here at the House MD Spot.