Yahoo! Messenger invisible users detector / scanner / checker / tracer (just in case someone doesn't want to copy and paste)
I hope you come back and participate in the forum; asking for a review is not generally the first thing you post on a forum without contributing to some discussions.
1) Your hosting sucks. The lag time I got before even getting a title in the title bar was excessive; even if it was in China, it was excessive.
2) Put some text on your site (page) explaining what your service is; not being a messenger user, I had to google it to find out.
3) Your smiley is rather pixelated looking to me. You may want to check into a better graphic.
I would comment more, but please add something for me to comment on.