HTTPS was crippled, since Netscape shipped only 40-bit RC4 internationally.[1]
PGP's source code was printed so it would fall under First Amendment protections, since binaries weren't legal for export.[2] (See also DJB's Bernstein v. United States)[3]
OpenBSD/OpenSSH is still based in Canada to avoid being subject to the laws.
Isn't it conceivable that the government would implement a similarly short-sighted (and ineffectual) policy if Bitcoins were seriously used to harm the US? :-P