I really like the design and I am trying it with a couple of tests, but it seems to be reporting the opposite of reality. Shows one of my sites as down though it says Keyword Found and it shows the response time, while another one which is really down is shown as up:
http://cl.ly/image/1Y1U3b0z2U0U
http://cl.ly/image/3c0e38312a2W
edit: If it is of any use for debugging, these sites' IDs are: 775909552 (up) and 775909549 (down).