Yahoo Messenger Status Checker
This is a diff method and I found it quite accidentally..
While running an nmap scan over the network, came to notice admdog on port 5101.
Did a quick Google on it..
and came to know that it was the yahoo messenger port.
So even if your friend is invisible running an nmap (provided you know the ip 
) you can get to know whether he is online.
But I found this hack to be pretty useful though even better methods are there to check on the Messenger Status.
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This is the official blog of Ajay George Palakuzhy known to his friends as AGP. I am currently working as a developer. I completed my Bachelor’s Degree in Electrical Engineering from NIT Warangal.
I did my schooling from Loyola School, Trivandrum.
My interests include Web Designing and Development,Programming, Internet Security, Music, watching movies…
This blog will be dealing with articles about the current trends in the world of web, cool tips to enhance your web experience, recent researches carried out by me and occasionally movie and music reviews.
You can read more about me at my homepage (coming soon)
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Invisible Scanner : http://yahoo.4tvn.com
it’s not working dude !
I never endorsed the site..
a very good invisible scanner is http://www.narubian.com never busy
I personally use http://www.detectinvisible.me, and I found it excellent.
Gorgeous interface, fast.
They even have a desktop application for yahoo status checking named Detect Invisible.Me.