HI folks, today only I just found one beautiful understandable post on comparative studies of various BI Enterprise Reporting Solutions by Shravan Kumar Kasagoni
on his superb post :Enterprise Reporting Solutions | Shravan Weblog
When I read that post its too good,But still I thought we should have simple comparative chart for easy explanation and fast knowledge 
..to save time
So I just use this content again and formed our own comparison hope Shravan wont mind
following is required comparison in very simple words but I know its not complete chart , So remaining point which I have missed or not included pleases go ahead and inform me ,Kick me or post me.
Lets make this comparison complete
If its not visible lets zoom it !!
1.SSRS
2.Business Objects XI WebIntelligence
3.Cognos Series 8
Hope this helps and continues with remaining points ..
(B)usiness (I)ntelligence Mentalist 
I’m not very familiar with Cognos Series 8 or Business Objects XI, but I do use SSRS and find it does the job very well for what I need it to do. Crystal Reports can also be useful, but does cost more than SSRS. Interesting information!
Yes Abhi infacat in future i think other two will vanish soon !!
great to know the comparisons…..
from this comparison, I think MS is Best for this????
Yes sunil hope MS will do that also soon !!!
Good differentiation n hope microsoft will work more on 5th n 6th to make it simple, silly…