The thread is going to get closed if I have to issue another warning for staying on topic.
Both sides need to offer a rational analysis and commentary on what the thread title statement signifies.
What sort of pressure or international consensus India intends to build by sharing evidence with various nations? How it will play out in terms of what the international community will demand of Pakistan, both rhetorically and tangibly?
While India may continue to hold out the threat of strikes on Pakistani territory, the fact is that any strikes have a very high potential of escalating the situation and really destabilize the region.
Instability in the region is anathema to the West, since instability will breed greater extremism and lack of control, and especially impact Afghanistan - unless one believes that is the West's goal, to destabilize and weaken Pakistan, and prop up India.
There are therefore going to be two opposing forces at work here - the necessity recognized by everyone to crack down on groups that evidence conclusively links with terrorism, and therefore the need to apply pressure on Pakistan to 'do more' on that front vs the need to not destabilize a young and relatively weak GoP and democracy in Pakistan.
Finally, evidence will have to be shared with Pakistan. It may be done through an intermediary like the US, if India remains unwilling to cooperate, but it will have to be shared. I don't see how the GoP can successfully prosecute any of the individuals it has arrested, for perpetrating the Mumbai attacks, unless the alleged intercepted phone calls, confessions etc. are provided to Pakistan and can be presented in a court of law.
The Bush Administration may not be as willing to understand the GoP's position on this issue, given that it was used to Musharraf circumventing the constitution when arresting and deporting people the US was interested in, as well as programs such as GITMO and extraordinary renditions that the US herself employed to act outside her own laws.
It remains to be seen whether the next US administration will be more amenable to working through the system in Pakistan, instead of circumventing it.