What do you do with a written testimony from someone you worked with? Specifically, how do you store a good recommendation when you don't have an immediate reason to show it to others?

Here's what I do: I upload the testimony to Posterous and turn on the "Mark this post as private" option. I also tag with the word "resume" or "testimony".

After I accumulate over time several testimonies, I can easily pass on the testimony link to a client or prospective employer. This keeps a cover letter or standard resume uncluttered. Only those who have the specific link can see the "private" post so this allows you to control the viewing audience.

Besides, it's fun to just click on the "testimony" tag for oneself to get a boost on a down day!