I am using the basic-auth twitter API (no longer available) to integrate twitter with my blog\'s commenting system. The problem with this and many other web APIs out there
If you don't want to use SSL, why not try some other protocol, such as kerberos?
A basic overview is here: http://www.kerberos.org/software/tutorial.html
Or if you want to go somewhat more in depth, see http://www.hitmill.com/computers/kerberos.html