Seeking help for a best idea to originate a web-site..

Dear friends & Mentors,

                            Iam planning to write a code for my web-site but Iam not geeting the Idea to which web-site I have to build-up.Iam thinking to run a commercial-website.Initially I planned to start "just-dial"like web-site but the infrastructure  and man-power is tooo big. It made me to lag back.The origin of this idea generated from my damn fruastation.As in doha its becoming diffcult to get the addresses of certain localities.Basically I working as a  operations Executive in a Logistics company  but my hobby of writing blogs making me to design a self-website.I was summed up with huge office work so I dont get time in daytime so I so I have to spend late nights.

                Please suggest me an websiteidea where the site could be helpful to most of the people I mean it must be interactive and informative to the people.So that I can pump-up little money from advertisers which can full-fill my late night labour work wages for writing programs...

                                       I convinced myself that If my site work-outs then I earn money and If my site fails then I earn experience. So investment is not a matter.Inspired by Richard-Branson's quote"A Business has to to be involving,it has to be fun and it has exercise your creative instincts.."

                                                             Help me out...........