Mod you would most like to see re-done under the Half-Life 2 engine / Source

[Magicpants]

There are one or two mods which personally i would love to see re-done on the source engine. I think my personal numero-uno would have to be NS (Natural Selection) - The half-life engine really lets this game down in my opinion and it could be so impressive if it made use of the physics provided by Source. e.g Skulks breaking out of vents dramatically, fade swings that actually cleave through the air, bullets bouncing of an onos' hard exo-armor...skulks gripping onto the ceiling and walls....all of these things and more.

Just another thing to pass the time to HL2's release...