Voice acting collab tools?

So on Monday May 1st I'm sending out ALL the stuff to ALL the voice actors so they can do they thing... I'm going to physically mail materials to peeps who have a lot of dialog as the reference movies might get too big... BUT I don't want to have to force them to physically mail me back they audio... now the files they are going to give me back are going to be uncompressed wav's or aiff's so they can get kinda big...

I'm wondering what the best way would be for them to send me the files back? Email is too slow and unwieldy... Dropbox is tite but requires a software install... Ftp is too geeky and I don't even have ftp access anymore... The best thing I can think of is the Soundcloud dropbox...

Has anyone used it? Looks tite! 120 minutes of time and anyone can upload even if they don't have a Soundcloud account... so that's what I'm going to go with for now... if anyone has any better ideas please let me know!

Thanks! AND I'm most likely posting the first teaser trailer on Monday ^_^ I'm not waiting anymore... NOTHING is going to stop me! Muahahahahaaaaaaa...BEWARE I LIVE!