I think that its unrealistic to assume that nobody is watching you (because we know thats untrue now) and that nobody bad is looking to harm what you do. It is trivial to inject an exploit into an unprotected webapp.
A alternative list of techs that'll help (imo, despite being nothing like yours):
> IRC
> XMPP
> Skype (alternatives welcome)
> Vagrant
> Favourite bug / productivity app.
> Your favorite wiki (if in doubt, use mediawiki)
> VPN (assuming you have need to connect to the office, you probably don't if you're using github type resources)
> Git
Basically, all the same stuff that'll help you work even if you're in the same office. I've worked from home for over 3 years, the #1 problem for me is the people in the office who don't use these tools.
Full disclosure: I wrote the tool during a work hackathon. It has come a long way since then.
I've been using cloudapp for the last year, but I'm curious about the dropbox thing.
There's also Servus (https://servus.io/) which is pretty much like cloudapp/droplr but using your dropbox.
