Just randomly requesting TinyURLs like you propose will get you banned since you are making many requests for non-existent TinyURLs. We do allow bots to crawl TinyURLs, but only if they are crawling TinyURLs that exist which they pulled from whatever source they are crawling.
Kevin "Gilby" Gilbertson
A Problem Easily Solved
Just provide for us an excel spreadsheet in the form of:
tinyurl ID | full URL
And scraping won't be necessary. Up for it?
--Jscott 20:25, 4 December 2010 (UTC)
Another URL shortener
Could you archive xrl.us (metamark.net), please? Thank you!
You could make a browser extension that records the long url for each short url that a person's browser visits, for certain known shorteners. This might be particularly helpful for uncooperative shorteners, since they wouldn't know the difference.
Then it would be a matter of encouraging many people to install the browser extension.