eVolo, an architecture and design journal, had it's 2010 skyscraper competition recently. I'm rather disturbed by the winners, they created a prison in the sky (really, guys? Is this what we've come to?)

Besides that, we get some more interesting entries, such as a skyscraper that purifies polluted rivers, or underwater 'skyscrapers'.

I'd recommend Inhabit's other articles, they have more underwater buildings, among other interesting, fantastical designs.