Granted it is not lawful to just download game after game unless you own the game already then you are allowed to download a copy, but who am I to say what games you own and what games you don't own. Anyway here's three sites where you can find easy to acquire emulators and roms without too many hoops to jump through.
- http://romhustler.net/ | very easy to use site I like them the most. Files appear to be clean but with anything you download a virus scan is always a good idea.
- http://www.emuparadise.me/ | a little bit more than just emulators and roms like game music, scans of comics and game magazines.
- http://coolrom.com/ | not as cool as they used to be but still quite good, seems to lack any Nintendo roms now, they used to carry them. They download process takes a few clicks but not bad.