
http://www.youtube.com/watch?v=pNfGbI5LWVU
[Promoted to front page - stabguy]
Jubair will not leave the building after the cutscene! Thanks to a few exploits you can get in the scene prior to the assassination and kill Jubair right before he teleports.
First of all, normally the ancestor's memory will start recording when you reach the roof of the building for the scene, but if you are detected that doesn't happen, with memory walls preventing you from going any further. There is a certain place on the west side of the building with a ledge that will lead you to a higher place on the roof, but getting to it is a little tricky. Get a guard to come after you to reach that place, then kill him to get rid of the memory walls. You want to hang on that ledge before he dies, so to delay his death I grab and throw him (I made the mistake of throwing him at a wall, which killed him faster). You need to be in the right spot to grab on that ledge when running up the wall.

http://www.youtube.com/watch?v=w-vYBX8cngs
[Front-paged by stabguy]
This video demonstrates a superfast blitz on Maria in memory block six Jerusalem. When you get within the area for the scene you are unable to do any high profile actions. Jump from the fence to the railing which leads you to where you can get in the huddle of the scene. Just go along the railing until you cannot move further because of an invisible wall. To get past the barrier drop down and hang from the side of the railing. Then move further, climb up and drop off the railing past the invisible barrier. You are now in the scene. For the blitz just stand behind Maria and start tapping the
button while the scene ends (remember to equip the hidden blade before starting the scene).
Blitzes: For the first blitz the camera view changes in .07 seconds, but Altair is just standing there. The kill animation starts in .14 seconds. For the second blitz the camera view also changes in .07 seconds, but I'm not sure if that's when the kill animation starts (also Altair's health bar appears a frame before the white flash). So I'm not really sure what the correct times are.

http://www.youtube.com/watch?v=peU2IVE4Ngs
[From the forums - stabguy]
Here are some assassinations I did on Abu'l Nuquod the merchant king.

http://www.youtube.com/watch?v=X31O38Jpyw0
[Front-paged - stabguy]
A superfast blitz on William is possible because of how the game works. When you get to the assassination jump from a certain spot on a roof to grasp the edge of a railing and pull yourself up. The scene won't start because you're not in an upright position. Jump from railing to railing and other structures to get near the gate entrance of the citadel. When you reach this destination and Altair is standing the scene will start and you are in the huddle of William, King Richard, and other soldiers. You can now walk inside the citadel to where William will appear after the scene. The camera view will focus on the scene outside, so steering your way in there can be tricky. You'll know if you've reached the target's room because there are two guards posted on either side of the entrance outside of it. Stand behind the table on the far side of the room and wait for William to appear by it after the scene ends, mashing the assassinate button. You know what happens next- William gets owned!!!

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This video shows how to assassinate Tamir by popping out of a haystack and then immediately hiding back in the same haystack.

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Version 2.0 contains updated blitzes of Tamir, Abu'l, Majd, Jubair, Maria, Robert and Al Mualim.
Blitz assassinations of all the main targets. The concept of this style is to assassinate as quickly as possible, while remaining Anonymous before the kill on certain targets: Tamir, Garnier de Naplouse, Abu'l Nuqoud, Majd Addin, William de Montferrat, Jubair Al Hakim and Sibrand.

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Step by step instructions on how to assassinate Robert de Sable very quickly:
You only get one shot at this per Memory Block playthrough. If you die and reload, Robert is already safely behind the blue memory wall.

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I saved William de Montferrat for last in Memory Block 4 because many players like to use Throwing Knives on this mission and Altaïr can carry 10 at a time if he's already finished off Abu'l Nuqoud and Majd Addin.
The Montferrat assassination seems to be Ubisoft's crown jewel of ASSASSIN'S CREED. It was the one they would always show in pre-release demos, so it must have been the first one that they developed. As such it feels more polished than some of the other missions. In fact, I think they added air to assassinate late in the development cycle and simultaneously placed a scaffold next to William.