Phd in Web Development, topic suggestion need

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Hi, here's another thread of scary story of one looking to study phd heh.
I'm very much interested in web development area since it's my expertise.
I have 3 masters in IT-related and have been working as a web developer for 10 years, now thinking of getting back to school!
The thing is I can't think of any specific topic in this area :-(
probably like many people when start thinking of study phd (or it's just me? :$ )
It would be good if it involves in building a web system, since I feel a bit more comfortable in practical stuff heh.
Since I've left school for quite a long while I'm a bit lost in where to start.
Any suggestion would be appreciated. Thanks.



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