I have a couple of solutions to this:
The first is very low-tech. If you post a twitter link please copy/paste the tweet into a HN comment.
The second is please simul-post your tweets to your personal blog. Of course this requires extra effort, but it could be alleviated by making a twitter client which provides simul-posting. Although such a client is probably against corp-law.
As more people are making informative tweets, we are locking too much valuable information away behind the tweet-wall.
I think this is an important post and am glad [whyoh] has raised the general topic.