How about Security on Web , one of the intresting topics i feel. Not a latest has been there for long.But has a wide scope over various domains.Agile testing is also a good topic for your presentation.
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security and performance os importnat for web
manually check the page opening time,load,progress etc
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<font color="blue">... and so much much more such that any comprehensive answer would certainly require a voluminous amount of text - voluminous enough to require one or more books: http://www.qalinks.com/Books/Web_Testing/ </font>
In other words, Jagath - the original poster will need to do some serious reading and research above and beyond answers typically found in a forum such as this.
Agile testing is one of the most followed technology in various companies now. Though it is not a new technology, this topic is unknown to few. You can go through the Agile testing process, practical problems in agile testing, advantages and disadvantages of the same... and so on.
Also, (though I dont have a detailed idea), heard that 'Personas' is also a new emerging technology especially in US.
Start exploring these two topics if you feel these are apt for your whitepaper.