Ban URL shorting services
There was a proposal over at Security.SE that URL shorteners be banned. I think this proposal should go for all of the SE sites. Except for in comments(and usually it's not needed there because there is a lot of room in them even), the use of URL shortening is completely pointless and only adds a level of indirection which puts readers at risk of malicious attacks.
So my proposal: When parsing links on new posts such as http://example.com check the domain against a list of common URL shortening domains. Examples include: bit.ly, tinyurl.com, tinyurl.cc, goo.gl, etc. and when they try to use such a url, bring up an error explaining for them to not use URL shorteners and to instead use a direct link.