The first one is *yawn*....so boring.
the italian entry does nothing for me. i like the one that was publishd in the Sunday Times, but i'd be very surprised if it won.
the mongelli one is certainly interesting, and would be a great landmark building, but i would like something a little more substantial, a bit taller for the U2 Tower.
at 60metres though, i think the design is going to have to be a bit radical for it to remain a "landmark building". while 60m may be tall for Dublin, it certainly isn't in world terms, and that height alone will not justify it's landmark title.