Our wizard has been getting away with murder - literally! 
Lasting Frost says:
Any target you hit with a power that has the cold keyword gains vulnerable 5 cold until the end of your next turn.
Up till now, our group has been playing without the connection that it requires a 'hit'. For those more astute than us (
), that means things like Frostburn that deal damage on the effect at the start of the creatures turn would not be affected by this feat if the orignal attack missed.
Furthermore, that means wall of ice does not work with Lasting Frost (unless it was made vulnerable with a different power before hand) and any dailies that the wizard misses with also does not provide the benefits of Lasting Frost.
This makes Lasting Frost that much more acceptable in my eyes. Hopefully others can learn from this post. We somehow didn't make the connection with this power with regards to hitting until I read the wizard article last night that was on DDI.

Lasting Frost says:
Any target you hit with a power that has the cold keyword gains vulnerable 5 cold until the end of your next turn.
Up till now, our group has been playing without the connection that it requires a 'hit'. For those more astute than us (

Furthermore, that means wall of ice does not work with Lasting Frost (unless it was made vulnerable with a different power before hand) and any dailies that the wizard misses with also does not provide the benefits of Lasting Frost.
This makes Lasting Frost that much more acceptable in my eyes. Hopefully others can learn from this post. We somehow didn't make the connection with this power with regards to hitting until I read the wizard article last night that was on DDI.