I was looking into a technet subscription a while back, I chose not to go with just for that reason. Apparantly every license you get from there, be it Office of Windows, expires the day you choose not to renew. I'm guessing it's because they're not "proper" licenses. Technet is for testing and development, getting full-blown retail licenses kinda negates that.
Don't take my word as absolute truth though, I'm no lawyer. I only read through the license fairly briefly when considering it. From a laymam's point of view it looks like unsubscribing invalidates it.
Edit:
PS I'd gotten a technet license a long time ago if I'd known that I could keep the licenses even though the subscription's expired. I'm a free-lance developer with a very uncertain income, I didn't get it because I wasn't sure I'd be able to afford renewing
it. Was better for me to just got with standard retail licenses.
