I tried to find one but I ended up "cheating". If you try and send from a gmail account it will fail but gmail will keep the file on its servers. So I can log into gmail at work, and download the binary from the failed sent message. sigh
In other news, I realized our "org.jruby:jruby-dist" maven artifact hasn't been publishing a full dist tarball, like it's supposed to, so we'll get that fixed.