limewire is pretty good actually, been using it for a while.

I'd like to write something longer but I usually run out of steam very quickly.

I recommend sending chunks of what you're writing to someone as you write them, means they can hassle you if they don't get the next installment. It means someone sees all your crappy writing, but it got me through a 60,000(ish) word story I would otherwise never have got past the third page of.