Dissrtation topic for M.Tech

Hi all,

I wanted a good dissertation topic for M.Tech.

Please suggest some good topic on any of the following subjects

1.Computer Networking
2.Database Systems and Applications
3.Data Warehousing and Data Mining
4.E-Business
5.Network Security
6.Inter-networking Technologies
7.Software Architectures
8.Software Engineering & Management
9.Software Testing and Quality Assurance
10.Object Oriented Analysis and Design


Please suggest some good topic from the above subjects. And some working model also to be presented with dissertation.

please help.

Thanks
Shubha