This site is updated constantly:

http://www.lazylaces.com/

There's usually tons of games where you are stuck in a room and have to figure how to get out.
Very addictive website!
(be sure to go to the 2nd and 3rd pages and on and on)
There's also a game on there called Cageling....search for it...took me 3 weeks to figure my way outta that game)

Also ....there is always Hapland:

http://foon.co.uk/farcade/hapland/

Very tricky to solve!

main page with the other Haplands:
http://foon.co.uk/

I think there's three Haplands and 2 others that are almost like it.

almost forgot...here is the game that started it all:

http://www.fasco-csc.com/works/crimson/crimson_e.php

Crimson room....it started the 'escape the room' type games.