Machanla, I wrote a small program which you can use to check your Etisalat post paid bills. Mind you this cannot check the current running bill, only the bills which have been already generated.
The fun part is you can check random user's bill if you enter a valid customer number. It even shows name & address. Here's a screen shot:
You can download the app here: http://www.mediafire.com/?vq0zp3tdjn7746h
More info in my blog
PS: Since there is lot of confusion going on about what is 'Customer No' (earlier referred to as Account No), it is not the 'Phone No'. So you cannot check usage details of a known Etisalat phone number. You need to find the 'Customer No' which comes printed in your bill. But you can always try random numbers. For example '505050' is a valid one