Picks: Hacker News and Transfer.sh
One thing that Leo found on Hacker News that he really finds useful is transfer.sh. This is a free command line utility that allows you to share files. They're offering free storage for files up to 10 GB. You just upload the file, you'll get a unique URL that you can share with anybody and the file will stay there for 2 weeks. There's even source code for it on Github.