The official formatting is <URL:http://your.url.com> and should be recognized by any decent mail reader (even with nth character limit, even webmails, etc.) Did you try it ?

I see "tinyurl" propositions. I think you should avoid it :

In reply to Re: E-mail 76th Character Issue by theon
in thread E-mail 76th Character Issue by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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