As many of you probably learnt by experience, Twitter Search only shows results for the last couple of days.
I guess, one of the preliminary assumptions is that you consider your collection of 140-character-long phrases valuable. And would like to search thru them from time to time.
I added my Del.icio.us feed to my Google Reader account. Then selected a feed item and clicked Share. Within Google Reader this works ok. I can click on the link and the corresponding URL opens.