Blocking the "popular" sites will only stimulate a lot of creativity in finding workarounds or other sources of the material. Which do you want - someone who visits a few sites on a regular basis or someone who visits A LOT of different and NEW sites to find what you're trying to block him from finding? To me, at least, it would seem that the risk of infection is proportional to the number of new sites visited...
Thats depends on the level of filtering on the Routers Firewall and the feature set. My Vigor 2100 router has the ability to deny web based requests for ActiveX, Executable files, Mulimedia files, Cookies, Java, Proxies etc as well as key word denial and accepting IP subnet ranges. Along with the time scheduling a reasonably robust filter can be setup which will be more tricky to disable if physical access to the router is denied. As with any filtering even with the programs which run in the PCs background the same issues apply, the end user of the PC will be just as creative in finding a workaround (and will have physical access to the computer) The user of the PC may have admin rights (or have the ability to gain admin rights, if they know what they are doing) and will quickly be able to disable or modify the web filtering security software. BTW no web filter works perfectly, far from it. Opera browser is also a good idea, which is what I use.
Good video showing the security features of the Draytek Vigor 2820 router.
http://www.youtube.com/watch?v=B6qIiYk6Lkc
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